org file, make available for project consistency

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+-*- mode: org -*-
+#+TITLE:       D nix, dev shells with overlays
+#+DESCRIPTION: dlang related nixpkgs of interest (dlang compilers & tools)
+#+FILETAGS:    :nixos:nixpkgs:dlang:compiler:
+#+AUTHOR:      Ralph Amissah
+#+EMAIL:       [[mailto:ralph.amissah@gmail.com][ralph.amissah@gmail.com]]
+#+COPYRIGHT:   Copyright (C) 2023 Ralph Amissah
+#+LICENSE:     Boost Software License 1.0
+#+LANGUAGE:    en
+#+STARTUP:     show3levels hideblocks hidestars noindent entitiespretty
+#+PROPERTY:    header-args  :exports code
+#+PROPERTY:    header-args+ :noweb yes
+#+PROPERTY:    header-args+ :results no
+#+PROPERTY:    header-args+ :cache no
+#+PROPERTY:    header-args+ :padline no
+#+PROPERTY:    header-args+ :mkdirp yes
+#+OPTIONS:     H:3 num:nil toc:t \n:nil @:t ::t |:t ^:nil _:nil -:t f:t *:t <:t
+
+* nix ( written to ../ )
+** README
+
+#+HEADER: :tangle "../README"
+#+BEGIN_SRC org
+-*- mode: org -*-
+,#+TITLE:       D related overlays
+,#+DESCRIPTION: ldc, dub, dtools: dlang compiler build tool and tools
+,#+FILETAGS:    :dlang:build:tools:
+,#+AUTHOR:      Ralph Amissah
+,#+EMAIL:       [[mailto:ralph.amissah@gmail.com][ralph.amissah@gmail.com]]
+,#+COPYRIGHT:   Copyright (C) 2022 - 2024 Ralph Amissah
+,#+LANGUAGE:    en
+,#+STARTUP:     content hideblocks hidestars noindent entitiespretty
+
+,* README for D related dev shells with overlays
+,** in emacs write (tangle) this (org) file for its output
+
+This org file: "dlang-nix-flakes.org" when using emacs and saved (tangling output)
+it creates and writes output to the subdirectory path:
+
+  ..
+
+and writes output there, this is to prevent accidentally writing over anything
+in the directory in which the dlang-nix-flakes.org file happens to be saved.
+
+.. becomes your nix flake work directory.
+
+,** dlang-nix-flakes.org
+
+the file dlang-nix-flakes.org contains nix related files for producing more
+recent versions of the dlang compiler and build tools: ldc, dub and dtools, than
+exist in nixpkgs at the time of publishing, in some cases with additional fixes.
+
+.envrc files
+
+nix control files
+  - default.nix
+  - shell.nix
+  - flake.nix
+
+nix overlays for (updates nixpkgs, more recent versions of):
+  - ldc     ( 1.30.0 -> <<ldc_version>> )
+  - dub     ( 1.23.0 -> <<dub_version>> ) [for nix versions 1.31.0 ... 1.33.0 broken]
+  - dtools  ( 2.095.1 -> <<dtools_version>> )
+
+  - dmd     ( 2.100.2 -> <<dmd_version>> ) KO ✗
+  - gdc     [not yet available]
+
+(updates nixpkgs circa 2023-05-12)
+
+dlang-nix-flakes.org --❯
+  .
+  └── dlang-nix-flakes
+      ├── #default.nix
+      ├── flake.lock
+      ├── flake.nix
+      ├── README
+      ├── shell.nix
+      └── nix-overlays
+          ├── dmd [not working]
+          │   ├── binary.nix
+          │   ├── bootstrap.nix
+          │   ├── default.nix
+          │   └── generic.nix
+          ├── dtools
+          │   └── default.nix
+          ├── dub
+          │   └── default.nix
+          └── ldc
+              ├── binary.nix
+              ├── bootstrap.nix
+              ├── default.nix
+              └── generic.nix
+
+search nixpkgs here:
+
+- https://search.nixos.org/packages?channel=unstable&from=0&size=100&sort=relevance&query=
+
+,** compilers
+,*** ldc OK ✓ ( 1.30.0 -> <<ldc_version>> )
+
+- https://wiki.dlang.org/LDC
+
+- https://github.com/ldc-developers/ldc
+  - https://github.com/ldc-developers/ldc/releases
+    nix-prefetch-url --unpack https://github.com/ldc-developers/ldc/archive/refs/tags/v<<ldc_version>>.tar.gz
+  - https://github.com/ldc-developers/ldc/issues
+
+- version in nixpkgs:
+  - https://search.nixos.org/packages?channel=unstable&show=ldc&from=0&size=100&sort=relevance&type=packages&query=ldc
+
+,*** dmd KO ✗ ( 2.100.2 -> <<dmd_version>> )
+
+- https://dlang.org/
+  - https://wiki.dlang.org/LDC
+
+- https://github.com/dlang/dmd
+  - https://github.com/dlang/dmd/tags
+    nix-prefetch-url --unpack https://github.com/dlang/dmd/archive/refs/tags/v<<dmd_version>>.tar.gz
+  - https://github.com/dlang/dmd/pulls
+
+- version in nixpkgs:
+  - https://search.nixos.org/packages?channel=unstable&show=dmd&from=0&size=100&sort=relevance&type=packages&query=dmd
+
+- dmd nixpkg modified and appears to build ok, but it appears my overlay does
+  not get things right REVIEW
+
+- dmd on nixos FAILS to build (my working projects), appears not to find parts
+  of itself
+
+,*** gdc ( not provided yet with gcc12 in nixpkgs )
+
+not yet provided in nixpkgs with gcc12, no attempt made
+
+- https://wiki.dlang.org/GDC
+  - https://wiki.dlang.org/GDC_Development
+
+- https://github.com/D-Programming-GDC/gdc
+
+,** build tool
+,*** dub ( 1.23.0 -> <<dub_version>> )
+
+- https://code.dlang.org/packages/dub
+
+- https://github.com/dlang/dub
+  - https://github.com/dlang/dub/releases
+    nix-prefetch-url --unpack https://github.com/dlang/dub/archive/refs/tags/v<<dub_version>>.tar.gz
+  - https://github.com/dlang/dub/issues
+
+- version in nixpkgs:
+  - https://search.nixos.org/packages?channel=unstable&show=dub&from=0&size=100&sort=relevance&type=packages&query=dub
+
+- dub nixpkg overlay is updated and runs most dub tests correctly
+
+- dub OK ✓ ( 1.30.0 -> <<dub_version>> )
+
+  from v1.31.0 requires seeting of pwd in buildPhase else fails to build
+  packages with nix tools that previous version of dub built;
+
+,** tools
+,*** dtools OK ✓ ( 2.095.1 -> <<dtools_version>> )
+
+- https://code.dlang.org/packages/dtools
+
+- https://github.com/dlang/tools
+  - https://github.com/dlang/tools/tags
+    nix-prefetch --unpack https://github.com/dlang/tools/archive/refs/tags/v<<dtools_version>>.tar.gz
+  - https://github.com/dlang/tools/issues
+
+- version in nixpkgs
+  - https://search.nixos.org/packages?channel=unstable&show=dtools&from=0&size=100&sort=relevance&type=packages&query=dtools
+
+,** nixpkgs
+
+It is possible to work directly against a local copy of nixpkgs. To do so you
+would clone nixpkgs and point to the local nixpkgs as your build source.
+
+git clone --depth=1 --branch master https://github.com/nixos/nixpkgs nixpkgs
+
+- ./nixpkgs/pkgs/development/compilers/ldc
+- ./nixpkgs/pkgs/development/compilers/dmd
+- ./nixpkgs/pkgs/development/tools/build-managers/dub
+- ./nixpkgs/pkgs/development/tools/dtools
+
+- ./nixpkgs/pkgs/development/compilers/gcc
+
+Note the overlays if copied to the nixpkgs path locations should work as they do
+in the overlay, with a pointer to the cloned nixpkgs as nixpkgs repository
+source. In fact the starting point for the overlays was to take verbatim what
+was in nixpkgs and then to update and fix where necessary those packages.
+
+It is possible to compare the changes made by the overlays here directly against
+what is currently available in nixpkgs.
+
+- https://search.nixos.org/packages?channel=unstable&size=100&sort=relevance&query=
+
+nix flake update && nix flake check --show-trace && nix flake info && echo "" && nix flake show
+  │
+  ├───devShells
+  │   └───x86_64-linux
+  │       ├───default: development environment 'nix-shell'
+  │       ├───dsh-nixpkgs-ldc-dub: development environment 'nixpkgs---ldc---dub'
+  │       ├───dsh-overlay-dmd-dub: development environment 'overlay---dmd-2.104.0---dub-1.30.0---broken'
+  │       ├───dsh-overlay-dtest-tilix: development environment 'overlay---ldc-1.32.2---dub-1.30.0---tilix---gtkd'
+  │       ├───dsh-overlay-dtools: development environment 'overlay---ldc-1.32.2---dub-1.30.0---dtools-2.103.1'
+  │       └───dsh-overlay-ldc-dub: development environment 'overlay---ldc-1.32.2---dub-1.30.0'
+  └───packages
+      └───x86_64-linux
+          ├───check-local-dir-build: package 'dummy-0.1.0'
+          ├───check-tilix: package 'tilix-1.9.5'
+          └───default: package 'tilix-1.9.5'
+
+#+END_SRC
+
+** .gitignore
+
+#+HEADER: :tangle "../.gitignore"
+#+BEGIN_SRC sh
+# git ls-files --others --exclude-from=.git/info/exclude
+# git check-ignore -v flake.lock
+# git clean -ix
+# find . -name "*_" | xargs rm -rf
+# find . -name "*.o" | xargs rm -rf
+,*
+!.gitignore
+!nixDevEnv.sh
+!.envrc
+!.envrc-local
+!.envrc-nix
+!flake.nix
+!flake.lock
+!nix-overlays
+!nix-overlays/**
+!shell.nix
+!makefile
+!justfile
+!README
+!*.nix
+!*.json
+!*.org
+!org/
+!org/*.org
+!*.sh
+!*.d
+!*.txt
+!src
+!src/**
+!views
+
+# EXCLUDED Files & directories - ensure excluded
+.dub/**
+tmp/**
+,*_.org
+,*_.nix
+,*_.d
+,*_.txt
+,*_
+,*.swp
+,*~
+,*.\#*
+\#*
+#+END_SRC
+
+** .env*
+*** .envrc
+
+#+HEADER: :tangle "../nixDevEnv.sh"
+#+BEGIN_SRC sh
+if [ -f .envrc ]; then
+  source_env_if_exists .envrc || source .envrc
+fi
+#+END_SRC
+
+#+HEADER: :tangle "../.envrc"
+#+BEGIN_SRC sh
+if [ -f .envrc-local ]; then
+  source_env_if_exists .envrc-local || source .envrc-local
+fi
+if [ -f .envrc-nix ]; then
+  source_env_if_exists .envrc-nix || source .envrc-nix
+fi
+#+END_SRC
+
+*** .envrc-local
+
+#+HEADER: :tangle "../.envrc-local"
+#+BEGIN_SRC sh
+#if [[ !( -f ./nix-flakes.org) && -f ../dlang-nix-flakes.org ]]; then
+#  # for editing purpose link to the .org file that creates ./dlang-nix-flakes/ content
+#  ln -s ../dlang-nix-flakes.org ./nix-flakes.org
+#fi
+if [[ ! -d ./.git ]]; then
+  git init
+  git add .
+fi
+#eval "$(nix print-dev-env)"
+#+END_SRC
+
+*** .envrc-nix
+
+- https://github.com/nix-community/nix-direnv
+  - source_url
+    - direnv fetchurl "https://raw.githubusercontent.com/nix-community/nix-direnv/<<direnv-version>>/direnvrc" "<<direnv-sha>>"
+    - ${NixDirEnvVersion}
+
+#+HEADER: :tangle "../.envrc-nix"
+#+BEGIN_SRC sh
+NIX_ENFORCE_PURITY=1
+# - https://github.com/nix-community/nix-direnv
+NixDirEnvVersion="<<direnv-version>>"
+NixDirEnvSHA="<<direnv-sha>>"
+if ! has nix_direnv_version || ! nix_direnv_version ${NixDirEnvVersion}; then
+  source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/${NixDirEnvVersion}/direnvrc" "${NixDirEnvSHA}"
+fi
+watch_file flake.lock
+watch_file flake.nix
+watch_file shell.nix
+watch_file makefile
+watch_file nixDevEnv.sh
+watch_file .envrc-local
+watch_file .envrc-nix
+nix flake update
+nix flake check
+nix flake show
+echo ""
+PATH_add result/bin
+use flake .
+#use flake .#default
+echo '
+- consider running:
+  ❯❯ nix flake show
+  ❯❯ nix flake update && nix flake check && nix flake show
+  ❯❯ nix flake update && nix flake check --show-trace && nix flake show && nix develop ".#devShell" -c $SHELL
+
+- for a dev shell:
+  ❯❯ nix develop
+  ❯❯ nix develop -c $SHELL
+  ❯❯ nix develop ".#dsh-overlay-ldc" --print-build-logs
+
+- to build project:
+  ❯❯ nix build --print-build-logs
+  ❯❯ nix build ".#" --print-build-logs
+'
+#+END_SRC
+
+*** 3.0.4
+
+#+NAME: direnv-version
+#+BEGIN_SRC sh
+3.0.4
+#+END_SRC
+
+#+NAME: direnv-sha
+#+BEGIN_SRC sh
+sha256-DzlYZ33mWF/Gs8DDeyjr8mnVmQGx7ASYqA5WlxwvBG4=
+#+END_SRC
+
+*** 3.0.0
+
+#+BEGIN_SRC sh
+3.0.0
+#+END_SRC
+
+#+BEGIN_SRC sh
+sha256-21TMnI2xWX7HkSTjFFri2UaohXVj854mgvWapWrxRXg=
+#+END_SRC
+
+*** 2.4.0
+
+#+BEGIN_SRC sh
+2.4.0
+#+END_SRC
+
+#+BEGIN_SRC sh
+sha256-XQzUAvL6pysIJnRJyR7uVpmUSZfc7LSgWQwq/4mBr1U=
+#+END_SRC
+
+#+BEGIN_SRC sh
+2.3.0
+#+END_SRC
+
+#+BEGIN_SRC sh
+sha256-Dmd+j63L84wuzgyjITIfSxSD57Tx7v51DMxVZOsiUD8=
+#+END_SRC
+
+#+NAME: direnv-sha_
+#+BEGIN_SRC sh
+sha256-0000000000000000000000000000000000000000000=
+#+END_SRC
+
+#+BEGIN_SRC sh
+- https://github.com/nix-community/nix-direnv
+NixDirEnvSHA="sha256-0000000000000000000000000000000000000000000="
+direnv fetchurl https://raw.githubusercontent.com/nix-community/nix-direnv/${NixDirEnvVersion}/direnvrc
+#+END_SRC
+
+** .nix
+*** flake.nix
+
+#+HEADER: :tangle "../flake.nix"
+#+BEGIN_SRC nix
+{
+  description = "build dummy D package using dub build tool";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+  inputs.flake-utils.url = "github:numtide/flake-utils";
+  outputs = {
+    self,
+    nixpkgs,
+    flake-utils,
+  } @ inputs: let
+    pname = "dummy";
+    version = "0.1.0";
+    shell = ./shell.nix;
+    devEnv = ./nixDevEnv.sh; # ./.envrc;
+    supportedSystems = ["x86_64-linux"]; # [ "x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin" ];
+    forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
+    nixpkgsFor = forAllSystems (system: import nixpkgs {inherit system;});
+    checkPhase = ''
+      runHook preCheck
+      #dub test --combined --skip-registry=all
+      runHook postCheck
+    '';
+    localOverlay = (final: prev: {
+      ldc = prev.callPackage ./nix-overlays/ldc {  };       # -> ok <<ldc_version>>
+      dmd = prev.callPackage ./nix-overlays/dmd {  };       # -> ok <<dmd_version>>
+      dub = prev.callPackage ./nix-overlays/dub {  };       # -> ? <<dub_version>>
+      dtools = prev.callPackage ./nix-overlays/dtools {  }; # -> ok <<dtools_version>>
+      #gdc = prev.callPackage ./nix-overlays/gdc {  };      # empty
+    });
+    pkgsForSystem = system: import nixpkgs {
+      overlays = [
+        localOverlay
+      ];
+      inherit system;
+    };
+    installPhase = ''
+      runHook preInstall
+      mkdir -p $out/bin
+      install -m755 ./bin/dummy $out/bin/dummy
+      runHook postInstall
+    '';
+    postInstall = ''
+      echo `ls -la $out/bin/dummy`
+      $out/bin/dummy -v
+    '';
+  in {
+    packages = forAllSystems (system: let
+      pkgs-ovl = pkgsForSystem system;
+      pkgs-nix = nixpkgsFor.${system};
+    in
+      with pkgs-ovl; {
+        default = tilix;
+        check-tilix = tilix;
+        check-local-dir-build = stdenv.mkDerivation {
+          inherit pname;
+          inherit version;
+          meta.mainProgram = "dummy";
+          executable = true;
+          src = self;
+          inherit shell;
+          inherit devEnv;
+          buildInputs = [sqlite];
+          nativeBuildInputs = [dub ldc gnumake]; # [ dub dmd ]; [ dub ldc ]; [ dub gdc ];
+          buildPhase = ''
+            runHook preBuild
+            for DC_ in dmd ldmd2 ldc2 gdc gdmd; do
+              echo "- check for D compiler $DC_"
+              DC=$(type -P $DC_ || echo "")
+              if [ ! "$DC" == "" ]; then break; fi
+            done
+            if [ "$DC" == "" ]; then exit "Error: could not find D compiler"; fi
+            echo "$DC_ used as D compiler to build $pname"
+            dub build --cache=local --compiler=$DC --build=$DC_ --combined --skip-registry=all
+            runHook postBuild
+          '';
+          inherit checkPhase;
+          inherit installPhase;
+          inherit postInstall;
+        };
+      });
+    devShells = forAllSystems (system: let
+      pkgs-ovl = pkgsForSystem system;
+      pkgs-nix = nixpkgsFor.${system};
+      shellHook = ''
+      '';
+    in
+      with pkgs-ovl; {
+        dsh-overlay-dtools = mkShell {
+          name = "overlay - ldc-<<ldc_version>> - dub-<<dub_version>> - dtools-<<dtools_version>>";
+          inherit shell;
+          inherit devEnv;
+          packages = [
+            gnumake
+            ldc
+            dub
+            dtools
+          ];
+          inherit shellHook;
+        };
+        dsh-overlay-ldc-dub = mkShell {
+          name = "overlay - ldc-<<ldc_version>> - dub-<<dub_version>>";
+          inherit shell;
+          inherit devEnv;
+          packages = [
+            gnumake
+            ldc
+            dub
+          ];
+          inherit shellHook;
+        };
+        dsh-overlay-dmd-dub = mkShell {
+          name = "overlay - dmd-<<dmd_version>> - dub-<<dub_version>> - broken";
+          inherit shell;
+          inherit devEnv;
+          packages = [
+            gnumake
+            dmd
+            dub
+          ];
+          inherit shellHook;
+        };
+        dsh-overlay-dtest-tilix = mkShell {
+          name = "overlay - ldc-<<ldc_version>> - dub-<<dub_version>> - tilix - gtkd";
+          inherit shell;
+          inherit devEnv;
+          packages = [
+            gnumake
+            ldc
+            gtkd
+            tilix
+            dub
+          ];
+          inherit shellHook;
+        };
+        #dsh-overlay-gdc = mkShell {
+        #  name = "dub + gdc dev shell";
+        #  inherit shell;
+        #  inherit devEnv;
+        #  packages = [
+        #    gnumake
+        #    gdc
+        #    dub
+        #  ];
+        #  inherit shellHook;
+        #};
+        dsh-nixpkgs-ldc-dub = mkShell {
+          name = "nixpkgs - ldc - dub";
+          inherit shell;
+          inherit devEnv;
+          packages = with pkgs-nix; [
+            ldc
+            dub
+            gnumake
+          ];
+          inherit shellHook;
+        };
+        dsh-nixpkgs-dmd-dub = mkShell {
+          name = "nixpkgs - ldc - dub";
+          inherit shell;
+          inherit devEnv;
+          packages = with pkgs-nix; [
+            dmd
+            dub
+            gnumake
+          ];
+          inherit shellHook;
+        };
+        default = import ./shell.nix {inherit pkgs-nix;};
+      });
+  };
+}
+#+END_SRC
+
+** shell.nix
+
+#+HEADER: :tangle "../shell.nix"
+#+HEADER: :tangle-mode (identity #o755)
+#+HEADER: :shebang "#!/usr/bin/env -S nix-shell --pure\n#!nix-shell -i bash"
+#+HEADER: :noweb yes
+#+BEGIN_SRC nix
+{pkgs-nix ? import <nixpkgs> {}}:
+with pkgs-nix;
+  mkShell {
+    buildInputs = [
+      # ❯❯❯ nix_related
+      #nix
+      direnv
+      #nixVersions.unstable
+      nix-prefetch-git
+      validatePkgConfig
+      nix-output-monitor
+      #nix-tree
+      #nvd
+      jq #gx
+      #alejandra
+      git
+      # ❯❯❯ dev
+      gnumake
+      ps
+      # ❯❯❯ d_build_related
+      # ❯❯ compiler
+      #dmd
+      #ldc
+      #rund
+      # ❯❯ package manager
+      #dub
+      # ❯❯ linker
+      #lld
+      #mold
+      # ❯❯ builder
+      #ninja
+      #meson
+      # ❯❯ tools
+      #dub
+      #dtools
+      # ❯❯❯ test
+      #tilix
+      #gtkd
+    ];
+    shellHook = ''
+    '';
+  }
+#+END_SRC
+
+*** default.nix
+
+will automatically build the default development shell, perhaps unecessary
+
+#+HEADER: :tangle-NO "../default.nix"
+#+HEADER: :tangle-mode (identity #o755)
+#+HEADER: :shebang "#!/usr/bin/env -S nix-build"
+#+BEGIN_SRC nix
+{pkgs ? import <nixpkgs> {}}:
+pkgs.callPackage ./shell.nix {}
+#+END_SRC
+
+* nixpkgs overlays ( written to ../nix-overlays/ )
+** ldc OK ✓
+*** info
+**** links
+
+- https://wiki.dlang.org/LDC
+
+- https://github.com/ldc-developers/ldc
+  - https://github.com/ldc-developers/ldc/releases
+  - https://github.com/ldc-developers/ldc/issues
+
+- version in nixpkgs:
+  - https://search.nixos.org/packages?channel=unstable&show=ldc&from=0&size=100&sort=relevance&type=packages&query=ldc
+
+**** notes
+
+- OK ldc 1.32.2 tested
+
+*** overlays
+**** default.nix OK ✓
+
+#+HEADER: :tangle "../nix-overlays/ldc/default.nix"
+#+BEGIN_SRC nix
+import ./generic.nix {
+  <<ldc_version_info>>
+}
+#+END_SRC
+
+**** generic.nix OK ✓ (unaltered)
+
+#+HEADER: :tangle "../nix-overlays/ldc/generic.nix"
+#+BEGIN_SRC nix
+{ version, sha256 }:
+{ lib, stdenv, fetchurl, cmake, ninja, <<ldc_llvm_set>>, curl, tzdata
+, libconfig, lit, gdb, unzip, darwin, bash
+, callPackage, makeWrapper, runCommand, targetPackages
+, ldcBootstrap ? callPackage ./bootstrap.nix { }
+}:
+
+let
+  pathConfig = runCommand "ldc-lib-paths" {} ''
+    mkdir $out
+    echo ${tzdata}/share/zoneinfo/ > $out/TZDatabaseDirFile
+    echo ${curl.out}/lib/libcurl${stdenv.hostPlatform.extensions.sharedLibrary} > $out/LibcurlPathFile
+  '';
+
+in
+
+stdenv.mkDerivation rec {
+  pname = "ldc";
+  inherit version;
+
+  src = fetchurl {
+    url = "https://github.com/ldc-developers/ldc/releases/download/v${version}/ldc-${version}-src.tar.gz";
+    inherit sha256;
+  };
+
+  # https://issues.dlang.org/show_bug.cgi?id=19553
+  hardeningDisable = [ "fortify" ];
+
+  postUnpack = ''
+    patchShebangs .
+  ''
+  + ''
+      rm ldc-${version}-src/tests/dmd/fail_compilation/mixin_gc.d
+      rm ldc-${version}-src/tests/dmd/runnable/xtest46_gc.d
+      rm ldc-${version}-src/tests/dmd/runnable/testptrref_gc.d
+
+      # test depends on current year
+      rm ldc-${version}-src/tests/dmd/compilable/ddocYear.d
+  ''
+  + lib.optionalString stdenv.hostPlatform.isDarwin ''
+      # https://github.com/NixOS/nixpkgs/issues/34817
+      rm -r ldc-${version}-src/tests/plugins/addFuncEntryCall
+  '';
+
+  postPatch = ''
+    # Setting SHELL=$SHELL when dmd testsuite is run doesn't work on Linux somehow
+    #substituteInPlace tests/dmd/Makefile --replace "SHELL=/bin/bash" "SHELL=${bash}/bin/bash"
+  ''
+  + lib.optionalString stdenv.hostPlatform.isLinux ''
+      substituteInPlace runtime/phobos/std/socket.d --replace "assert(ih.addrList[0] == 0x7F_00_00_01);" ""
+  ''
+  + lib.optionalString stdenv.hostPlatform.isDarwin ''
+      substituteInPlace runtime/phobos/std/socket.d --replace "foreach (name; names)" "names = []; foreach (name; names)"
+  '';
+
+  nativeBuildInputs = [
+    cmake ldcBootstrap lit lit.python <<ldc_llvm_set>>.dev makeWrapper ninja unzip
+  ]
+  ++ lib.optionals stdenv.hostPlatform.isDarwin [
+    darwin.apple_sdk.frameworks.Foundation
+  ]
+  ++ lib.optionals (!stdenv.hostPlatform.isDarwin) [
+    # https://github.com/NixOS/nixpkgs/pull/36378#issuecomment-385034818
+    gdb
+  ];
+
+  buildInputs = [ curl tzdata ];
+
+  cmakeFlags = [
+    "-DD_FLAGS=-d-version=TZDatabaseDir;-d-version=LibcurlPath;-J${pathConfig}"
+  ];
+
+  postConfigure = ''
+    export DMD=$PWD/bin/ldmd2
+  '';
+
+  makeFlags = [ "DMD=$DMD" ];
+
+  fixNames = lib.optionalString stdenv.hostPlatform.isDarwin  ''
+    fixDarwinDylibNames() {
+      local flags=()
+
+      for fn in "$@"; do
+        flags+=(-change "$(basename "$fn")" "$fn")
+      done
+
+      for fn in "$@"; do
+        if [ -L "$fn" ]; then continue; fi
+        echo "$fn: fixing dylib"
+        install_name_tool -id "$fn" "''${flags[@]}" "$fn"
+      done
+    }
+
+    fixDarwinDylibNames $(find "$(pwd)/lib" -name "*.dylib")
+    export DYLD_LIBRARY_PATH=$(pwd)/lib
+  '';
+
+  # https://github.com/ldc-developers/ldc/issues/2497#issuecomment-459633746
+  additionalExceptions = lib.optionalString stdenv.hostPlatform.isDarwin
+    "|druntime-test-shared";
+
+  checkPhase = ''
+    # Build default lib test runners
+    ninja -j$NIX_BUILD_CORES all-test-runners
+
+    ${fixNames}
+
+    # Run dmd testsuite
+    export DMD_TESTSUITE_MAKE_ARGS="-j$NIX_BUILD_CORES DMD=$DMD"
+    ctest -V -R "dmd-testsuite"
+
+    # Build and run LDC D unittests.
+    ctest --output-on-failure -R "ldc2-unittest"
+
+    # Run LIT testsuite.
+    ctest -V -R "lit-tests"
+
+    # Run default lib unittests
+    ctest -j$NIX_BUILD_CORES --output-on-failure -E "ldc2-unittest|lit-tests|dmd-testsuite${additionalExceptions}"
+  '';
+
+  postInstall = ''
+    wrapProgram $out/bin/ldc2 \
+        --prefix PATH ":" "${targetPackages.stdenv.cc}/bin" \
+        --set-default CC "${targetPackages.stdenv.cc}/bin/cc"
+   '';
+
+  meta = with lib; {
+    description = "The LLVM-based D compiler";
+    homepage = "https://github.com/ldc-developers/ldc";
+    # from https://github.com/ldc-developers/ldc/blob/master/LICENSE
+    license = with licenses; [ bsd3 boost mit ncsa gpl2Plus ];
+    maintainers = with maintainers; [ lionello jtbx ];
+    platforms = [ "x86_64-linux" "i686-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
+  };
+}
+#+END_SRC
+
+**** bootstrap.nix
+
+#+HEADER: :tangle "../nix-overlays/ldc/bootstrap.nix"
+#+BEGIN_SRC nix
+<<ldc_bootstrap_1-25-0>>
+#+END_SRC
+
+#+NAME: ldc_bootstrap_1-25-0
+#+BEGIN_SRC nix
+{ callPackage }:
+callPackage ./binary.nix {
+  version = "1.25.0";
+  hashes = {
+    # Get these from `nix-prefetch-url https://github.com/ldc-developers/ldc/releases/download/v1.19.0/ldc2-1.19.0-osx-x86_64.tar.xz` etc..
+    osx-x86_64 = "sha256-6iKnbS+oalLKmyS8qYD/wS21b7+O+VgsWG2iT4PrWPU=";
+    linux-x86_64 = "sha256-sfg47RdlsIpryc3iZvE17OtLweh3Zw6DeuNJYgpuH+o=";
+    linux-aarch64  = "sha256-UDZ43x4flSo+SfsPeE8juZO2Wtk2ZzwySk0ADHnvJBI=";
+    osx-arm64  = "sha256-O/x0vy0wwQFaDc4uWSeMhx+chJKqbQb6e5QNYf+7DCw=";
+  };
+}
+#+END_SRC
+
+#+NAME: ldc_bootstrap_1-30-0
+#+BEGIN_SRC nix
+{ callPackage }:
+callPackage ./binary.nix {
+  version = "1.30.0";
+  hashes = {
+    # Get these from `nix store prefetch-file https://github.com/ldc-developers/ldc/releases/download/v1.19.0/ldc2-1.19.0-osx-x86_64.tar.xz` etc..
+    osx-x86_64 = "sha256-AAWZvxuZC82xvrW6fpYm783TY+H8k3DvqE94ZF1yjmk=";
+    linux-x86_64 = "sha256-V4TUzEfQhFrwiX07dHOgjdAoGkzausCkhnQIQNAU/eE=";
+    linux-aarch64  = "sha256-kTeglub75iv/jWWNPCn15aCGAbmck0RQl6L7bFOUu7Y=";
+    osx-arm64  = "sha256-Nb/owBdIeroB9jLMDvwjo8bvsTC9vFyJPLMTOMsSAd4=";
+  };
+}
+#+END_SRC
+
+- this is the ldc bootstrap in current use, nixpkgs:
+
+#+BEGIN_SRC nix
+{ callPackage }:
+callPackage ./binary.nix {
+  version = "1.30.0";
+  hashes = {
+    # Get these from `nix store prefetch-file https://github.com/ldc-developers/ldc/releases/download/v1.19.0/ldc2-1.19.0-osx-x86_64.tar.xz` etc..
+    osx-x86_64 = "sha256-AAWZvxuZC82xvrW6fpYm783TY+H8k3DvqE94ZF1yjmk=";
+    linux-x86_64 = "sha256-V4TUzEfQhFrwiX07dHOgjdAoGkzausCkhnQIQNAU/eE=";
+    linux-aarch64  = "sha256-kTeglub75iv/jWWNPCn15aCGAbmck0RQl6L7bFOUu7Y=";
+    osx-arm64  = "sha256-Nb/owBdIeroB9jLMDvwjo8bvsTC9vFyJPLMTOMsSAd4=";
+  };
+}
+#+END_SRC
+
+**** binary.nix (unaltered)
+
+#+HEADER: :tangle "../nix-overlays/ldc/binary.nix"
+#+BEGIN_SRC nix
+{ lib, stdenv, fetchurl, curl, tzdata, autoPatchelfHook, fixDarwinDylibNames, libxml2
+, version, hashes }:
+
+let
+  inherit (stdenv) hostPlatform;
+  OS = if hostPlatform.isDarwin then "osx" else hostPlatform.parsed.kernel.name;
+  ARCH = if hostPlatform.isDarwin && hostPlatform.isAarch64 then "arm64" else hostPlatform.parsed.cpu.name;
+in stdenv.mkDerivation {
+  pname = "ldc-bootstrap";
+  inherit version;
+
+  src = fetchurl rec {
+    name = "ldc2-${version}-${OS}-${ARCH}.tar.xz";
+    url = "https://github.com/ldc-developers/ldc/releases/download/v${version}/${name}";
+    sha256 = hashes."${OS}-${ARCH}" or (throw "missing bootstrap sha256 for ${OS}-${ARCH}");
+  };
+
+  dontConfigure = true;
+  dontBuild = true;
+
+  nativeBuildInputs = lib.optionals hostPlatform.isLinux [
+    autoPatchelfHook
+  ] ++ lib.optional hostPlatform.isDarwin fixDarwinDylibNames;
+
+  buildInputs = lib.optionals stdenv.hostPlatform.isLinux [ libxml2 stdenv.cc.cc ];
+
+  propagatedBuildInputs = [ curl tzdata ];
+
+  installPhase = ''
+    mkdir -p $out
+
+    mv bin etc import lib LICENSE README $out/
+  '';
+
+  meta = with lib; {
+    description = "The LLVM-based D Compiler";
+    homepage = "https://github.com/ldc-developers/ldc";
+    # from https://github.com/ldc-developers/ldc/blob/master/LICENSE
+    license = with licenses; [ bsd3 boost mit ncsa gpl2Plus ];
+    maintainers = with maintainers; [ lionello ];
+    platforms = [ "x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin" ];
+  };
+}
+#+END_SRC
+
+*** versions SET
+**** selected version SET OK ✓
+***** version & sha256 nix composite
+
+#+NAME: ldc_version_info
+#+BEGIN_SRC nix
+version = "<<ldc_version>>";
+sha256 = "<<ldc_hash>>";
+#+END_SRC
+
+***** select version SET OK ✓
+
+#+NAME: ldc_version
+#+BEGIN_SRC nix
+<<ldc_version_1_37_0>>
+#+END_SRC
+
+#+NAME: ldc_hash
+#+BEGIN_SRC nix
+<<ldc_hash_1_37_0>>
+#+END_SRC
+
+#+NAME: ldc_llvm_set
+#+BEGIN_SRC nix
+<<ldc_llvm_set_1_37_0>>
+#+END_SRC
+
+**** 1.37 OK ✓
+***** 1.37.0 OK ✓
+
+- nix-prefetch-url --unpack https://github.com/ldc-developers/ldc/archive/refs/tags/v1.37.0.tar.gz
+- nix-prefetch-url --unpack https://github.com/ldc-developers/ldc/releases/download/v${version}/ldc-${version}-src.tar.gz
+
+#+NAME: ldc_version_1_37_0
+#+BEGIN_SRC nix
+1.37.0
+#+END_SRC
+
+#+NAME: ldc_hash_1_37_0
+#+BEGIN_SRC nix
+sha256-UOgK48Q2yQY3wsPUDzktwotyH3qrOh48o79PnCjboGQ=
+#+END_SRC
+
+#+NAME: ldc_llvm_set_1_37_0
+#+BEGIN_SRC nix
+llvm_17
+#+END_SRC
+
+**** 1.36 OK ✓
+***** 1.36.0 OK ✓
+
+- nix-prefetch-url --unpack https://github.com/ldc-developers/ldc/archive/refs/tags/v1.36.0.tar.gz
+
+#+NAME: ldc_version_1_36_0
+#+BEGIN_SRC nix
+1.36.0
+#+END_SRC
+
+#+NAME: ldc_hash_1_36_0
+#+BEGIN_SRC nix
+sha256-oAx5BzEjqIfBf0Rsd4KklVajUSo9Natna31Trhu41u8=
+#+END_SRC
+
+#+NAME: ldc_llvm_set_1_36_0
+#+BEGIN_SRC nix
+llvm_17
+#+END_SRC
+
+**** 1.35 OK ✓
+***** 1.35.0 OK ✓
+
+- nix-prefetch-url --unpack https://github.com/ldc-developers/ldc/archive/refs/tags/v1.35.0.tar.gz
+
+#+NAME: ldc_version_1_35_0
+#+BEGIN_SRC nix
+1.35.0
+#+END_SRC
+
+#+NAME: ldc_hash_1_35_0
+#+BEGIN_SRC nix
+sha256-bilpk3BsdsCT5gkTmqCz+HBDVfoPN1b2dY141EIm36A=
+#+END_SRC
+
+#+NAME: ldc_llvm_set_1_35_0
+#+BEGIN_SRC nix
+llvm_16
+#+END_SRC
+
+**** 1.34 OK ✓
+***** 1.34.0 OK ✓
+
+- nix-prefetch-url --unpack https://github.com/ldc-developers/ldc/archive/refs/tags/v1.34.0.tar.gz
+
+#+NAME: ldc_version_1_34_0
+#+BEGIN_SRC nix
+1.34.0
+#+END_SRC
+
+#+NAME: ldc_hash_1_34_0
+#+BEGIN_SRC nix
+sha256-MAXG6ceSWFOMg5eXZnZ6WePXTzy5CsLLDc5ddXO+txk=
+#+END_SRC
+
+#+NAME: ldc_llvm_set_1_34_0
+#+BEGIN_SRC nix
+llvm_16
+#+END_SRC
+
+**** 1.33 OK ✓
+***** 1.33.0 OK ✓
+
+- nix-prefetch-url --unpack https://github.com/ldc-developers/ldc/archive/refs/tags/v1.33.0.tar.gz
+
+#+NAME: ldc_version_1_33_0
+#+BEGIN_SRC nix
+1.33.0
+#+END_SRC
+
+#+NAME: ldc_hash_1_33_0
+#+BEGIN_SRC nix
+sha256-g0wbCMX1s6mPnvuvhjLw03fRfawcFxDkg8nuaEZYw6g=
+#+END_SRC
+
+#+NAME: ldc_llvm_set_1_33_0
+#+BEGIN_SRC nix
+llvm_15
+#+END_SRC
+
+**** 1.32
+***** 1.32.2 OK ✓
+
+- nix-prefetch-url --unpack https://github.com/ldc-developers/ldc/archive/refs/tags/v1.32.1.tar.gz
+
+#+NAME: ldc_version_1_32_2
+#+BEGIN_SRC nix
+1.32.2
+#+END_SRC
+
+#+NAME: ldc_hash_1_32_2
+#+BEGIN_SRC nix
+sha256-v6Sq7nQyChJohDyI4inzObLfCVOkvLT87VLr4N2hzZU=
+#+END_SRC
+
+#+NAME: ldc_llvm_set_1_32_2
+#+BEGIN_SRC nix
+llvm_15
+#+END_SRC
+
+***** 1.32.1
+
+- nix-prefetch-url --unpack https://github.com/ldc-developers/ldc/archive/refs/tags/v1.32.1.tar.gz
+
+#+NAME: ldc_version_1_32_1
+#+BEGIN_SRC nix
+1.32.1
+#+END_SRC
+
+#+NAME: ldc_hash_1_32_1
+#+BEGIN_SRC nix
+sha256-s1U7+qiVJDF+zSHrLGPG6g+acIChYnXkb9p+OrNX6g8=
+#+END_SRC
+
+#+NAME: ldc_llvm_set_1_32_1
+#+BEGIN_SRC nix
+llvm_14
+#+END_SRC
+
+***** 1.32.0
+
+- nix-prefetch-url --unpack https://github.com/ldc-developers/ldc/archive/refs/tags/v1.32.0.tar.gz
+
+#+NAME: ldc_version_1_32_0
+#+BEGIN_SRC nix
+1.32.0
+#+END_SRC
+
+#+NAME: ldc_hash_1_32_0
+#+BEGIN_SRC nix
+sha256-xO4L+RtBbdVkE1PZsme2pIYAxJnHgr6xEtLkYOMpvqw=
+#+END_SRC
+
+#+NAME: ldc_llvm_set_1_32_0
+#+BEGIN_SRC nix
+llvm_14
+#+END_SRC
+
+**** 1.31
+***** 1.31.0
+
+- nix-prefetch-url --unpack https://github.com/ldc-developers/ldc/archive/refs/tags/v1.31.0.tar.gz
+
+#+NAME: ldc_version_1_31_0
+#+BEGIN_SRC nix
+1.31.0
+#+END_SRC
+
+#+NAME: ldc_hash_1_31_0
+#+BEGIN_SRC nix
+sha256-8cjs6eHjWAbDRBvyT75mbN3Y7vN1WSwZzY/uRwHNVFg=
+#+END_SRC
+
+#+NAME: ldc_llvm_set_1_31_0
+#+BEGIN_SRC nix
+llvm_14
+#+END_SRC
+
+***** 1.30.0
+
+- nix-prefetch-url --unpack https://github.com/ldc-developers/ldc/archive/refs/tags/v1.30.0.tar.gz
+
+#+NAME: ldc_version_1_30_0
+#+BEGIN_SRC nix
+1.30.0
+#+END_SRC
+
+#+NAME: ldc_hash_1_30_0
+#+BEGIN_SRC nix
+sha256-/bs3bwgkLZF5IqaiKnc5gCF/r6MQBG/F1kWUkK8j2s0=
+#+END_SRC
+
+#+NAME: ldc_llvm_set_1_30_0
+#+BEGIN_SRC nix
+llvm_14
+#+END_SRC
+
+** dmd OK ✓
+*** info
+**** links
+
+- https://dlang.org/
+  - https://wiki.dlang.org/DMD
+
+- https://github.com/dlang/dmd
+  - https://github.com/dlang/dmd/tags
+  - https://github.com/dlang/dmd/pulls
+
+- version in nixpkgs:
+  - https://search.nixos.org/packages?channel=unstable&show=dmd&from=0&size=100&sort=relevance&type=packages&query=dmd
+
+**** notes KO ✗
+
+- dmd nixpkg modified and appears to build ok
+
+- ISSUES dmd on nixos FAILS to build (my working projects), appears not to find parts of itself
+
+*** overlays
+**** default.nix
+
+#+HEADER: :tangle "../nix-overlays/dmd/default.nix"
+#+BEGIN_SRC nix
+import ./generic.nix {
+  version = "<<dmd_version>>";
+  dmdSha256 = "<<dmd_hash>>";
+  phobosSha256 = "<<phobos_hash>>";
+}
+#+END_SRC
+
+**** generic.nix
+
+#+HEADER: :tangle "../nix-overlays/dmd/generic.nix"
+#+BEGIN_SRC nix
+{ version
+, dmdSha256
+, phobosSha256
+}:
+
+{ stdenv
+, lib
+, fetchFromGitHub
+, removeReferencesTo
+, makeWrapper
+, which
+, writeTextFile
+, curl
+, tzdata
+, gdb
+#, Foundation
+, callPackage
+, targetPackages
+, fetchpatch
+, bash
+, installShellFiles
+, git
+, unzip
+, dmdBootstrap ? callPackage ./bootstrap.nix { }
+, dmd_bin ? "${dmdBootstrap}/bin"
+}:
+
+let
+  dmdConfFile = writeTextFile {
+    name = "dmd.conf";
+    text = (lib.generators.toINI { } {
+      Environment = {
+        DFLAGS = ''-I@out@/include/dmd -L-L@out@/lib -fPIC ${lib.optionalString (!targetPackages.stdenv.cc.isClang) "-L--export-dynamic"}'';
+      };
+    });
+  };
+
+  bits = builtins.toString stdenv.hostPlatform.parsed.cpu.bits;
+  osname =
+    if stdenv.isDarwin then
+      "osx"
+    else
+      stdenv.hostPlatform.parsed.kernel.name;
+
+  pathToDmd = "\${NIX_BUILD_TOP}/dmd/generated/${osname}/release/${bits}/dmd";
+in
+
+stdenv.mkDerivation rec {
+  pname = "dmd";
+  inherit version;
+
+  enableParallelBuilding = true;
+
+  srcs = [
+    (fetchFromGitHub {
+      owner = "dlang";
+      repo = "dmd";
+      rev = "v${version}";
+      sha256 = dmdSha256;
+      name = "dmd";
+    })
+    (fetchFromGitHub {
+      owner = "dlang";
+      repo = "phobos";
+      rev = "v${version}";
+      sha256 = phobosSha256;
+      name = "phobos";
+    })
+  ];
+
+  sourceRoot = ".";
+
+  # https://issues.dlang.org/show_bug.cgi?id=19553
+  hardeningDisable = [ "fortify" ];
+
+  patches = lib.optionals (lib.versionOlder version "2.088.0") [
+    # Migrates D1-style operator overloads in DMD source, to allow building with
+    # a newer DMD
+    (fetchpatch {
+      url = "https://github.com/dlang/dmd/commit/c4d33e5eb46c123761ac501e8c52f33850483a8a.patch";
+      stripLen = 1;
+      extraPrefix = "dmd/";
+      sha256 = "sha256-N21mAPfaTo+zGCip4njejasraV5IsWVqlGR5eOdFZZE=";
+    })
+  ];
+
+  postPatch = ''
+    patchShebangs dmd/compiler/test/{runnable,fail_compilation,compilable,tools}{,/extra-files}/*.sh
+
+    rm dmd/compiler/test/runnable/gdb1.d
+    rm dmd/compiler/test/runnable/gdb10311.d
+    rm dmd/compiler/test/runnable/gdb14225.d
+    rm dmd/compiler/test/runnable/gdb14276.d
+    rm dmd/compiler/test/runnable/gdb14313.d
+    rm dmd/compiler/test/runnable/gdb14330.d
+    rm dmd/compiler/test/runnable/gdb15729.sh
+    rm dmd/compiler/test/runnable/gdb4149.d
+    rm dmd/compiler/test/runnable/gdb4181.d
+    rm dmd/compiler/test/compilable/ddocYear.d
+
+    # Disable tests that rely on objdump whitespace until fixed upstream:
+    #   https://issues.dlang.org/show_bug.cgi?id=23317
+    rm dmd/compiler/test/runnable/cdvecfill.sh
+    rm dmd/compiler/test/compilable/cdcmp.d
+  ''
+
+  + lib.optionalString (lib.versionAtLeast version "2.089.0" && lib.versionOlder version "2.092.2") ''
+    rm dmd/compiler/test/dshell/test6952.d
+  '' + lib.optionalString (lib.versionAtLeast version "2.092.2") ''
+    substituteInPlace dmd/compiler/test/dshell/test6952.d --replace "/usr/bin/env bash" "${bash}/bin/bash"
+  ''
+
+  + lib.optionalString stdenv.isLinux ''
+    substituteInPlace phobos/std/socket.d --replace "assert(ih.addrList[0] == 0x7F_00_00_01);" ""
+  '' + lib.optionalString stdenv.isDarwin ''
+    substituteInPlace phobos/std/socket.d --replace "foreach (name; names)" "names = []; foreach (name; names)"
+  '';
+
+  nativeBuildInputs = [
+    makeWrapper
+    which
+    installShellFiles
+  ] ++ lib.optionals (lib.versionOlder version "2.088.0") [
+    git
+  ];
+
+  buildInputs = [
+    curl
+    tzdata
+  # ] ++ lib.optionals stdenv.isDarwin [
+  #   Foundation
+  ];
+
+  nativeCheckInputs = [
+    gdb
+  ] ++ lib.optionals (lib.versionOlder version "2.089.0") [
+    unzip
+  ];
+
+  buildFlags = [
+    "BUILD=release"
+    "ENABLE_RELEASE=1"
+    "PIC=1"
+  ];
+
+  # Build and install are based on http://wiki.dlang.org/Building_DMD
+  buildPhase = ''
+    runHook preBuild
+
+    export buildJobs=$NIX_BUILD_CORES
+    if [ -z $enableParallelBuilding ]; then
+      buildJobs=1
+    fi
+
+    ${dmd_bin}/rdmd dmd/compiler/src/build.d -j$buildJobs HOST_DMD=${dmd_bin}/dmd $buildFlags
+    make -C dmd/druntime -f posix.mak DMD=${pathToDmd} $buildFlags -j$buildJobs
+    echo ${tzdata}/share/zoneinfo/ > TZDatabaseDirFile
+    echo ${lib.getLib curl}/lib/libcurl${stdenv.hostPlatform.extensions.sharedLibrary} > LibcurlPathFile
+    make -C phobos -f posix.mak $buildFlags -j$buildJobs DMD=${pathToDmd} DFLAGS="-version=TZDatabaseDir -version=LibcurlPath -J$PWD"
+
+    runHook postBuild
+  '';
+
+  doCheck = true;
+
+  checkFlags = buildFlags;
+
+  # many tests are disbled because they are failing
+
+  # NOTE: Purity check is disabled for checkPhase because it doesn't fare well
+  # with the DMD linker. See https://github.com/NixOS/nixpkgs/issues/97420
+  checkPhase = ''
+    runHook preCheck
+
+    export checkJobs=$NIX_BUILD_CORES
+    if [ -z $enableParallelChecking ]; then
+      checkJobs=1
+    fi
+
+    NIX_ENFORCE_PURITY= \
+      make -C dmd/compiler/test $checkFlags CC=$CXX SHELL=$SHELL -j$checkJobs N=$checkJobs
+
+    NIX_ENFORCE_PURITY= \
+      make -C phobos -f posix.mak unittest $checkFlags -j$checkJobs DFLAGS="-version=TZDatabaseDir -version=LibcurlPath -J$PWD"
+
+    runHook postCheck
+  '';
+
+  installPhase = ''
+    runHook preInstall
+
+    install -Dm755 ${pathToDmd} $out/bin/dmd
+
+    installManPage dmd/docs/man/man*/*
+
+    mkdir -p $out/include/dmd
+    cp -r {dmd/druntime/import/*,phobos/{std,etc}} $out/include/dmd/
+
+    mkdir $out/lib
+    cp phobos/generated/${osname}/release/${bits}/libphobos2.* $out/lib/
+
+    wrapProgram $out/bin/dmd \
+      --prefix PATH ":" "${targetPackages.stdenv.cc}/bin" \
+      --set-default CC "${targetPackages.stdenv.cc}/bin/cc"
+
+    substitute ${dmdConfFile} "$out/bin/dmd.conf" --subst-var out
+
+    runHook postInstall
+  '';
+
+  preFixup = ''
+    find $out/bin -type f -exec ${removeReferencesTo}/bin/remove-references-to -t ${dmd_bin}/dmd '{}' +
+  '';
+
+  disallowedReferences = [ dmdBootstrap ];
+
+  meta = with lib; {
+    description = "Official reference compiler for the D language";
+    homepage = "https://dlang.org/";
+    # Everything is now Boost licensed, even the backend.
+    # https://github.com/dlang/dmd/pull/6680
+    license = licenses.boost;
+    maintainers = with maintainers; [ lionello dukc jtbx ];
+    platforms = [ "x86_64-linux" "i686-linux" "x86_64-darwin" ];
+  };
+}
+#+END_SRC
+
+**** bootstrap.nix
+
+#+HEADER: :tangle "../nix-overlays/dmd/bootstrap.nix"
+#+BEGIN_SRC nix
+{ callPackage }:
+callPackage ./binary.nix {
+  version = "2.090.1";
+  hashes = {
+    # Get these from `nix-prefetch-url http://downloads.dlang.org/releases/2.x/2.090.1/dmd.2.090.1.linux.tar.xz` etc..
+    osx = "sha256-9HwGVO/8jfZ6aTiDIUi8w4C4Ukry0uUS8ACP3Ig8dmU=";
+    linux = "sha256-ByCrIA4Nt7i9YT0L19VXIL1IqIp+iObcZux407amZu4=";
+  };
+}
+#+END_SRC
+
+**** binary.nix
+
+#+HEADER: :tangle "../nix-overlays/dmd/binary.nix"
+#+BEGIN_SRC nix
+{ lib, stdenv, fetchurl, curl, tzdata, autoPatchelfHook, fixDarwinDylibNames, glibc
+, version, hashes }:
+
+let
+  inherit (stdenv) hostPlatform;
+  OS = if hostPlatform.isDarwin then "osx" else hostPlatform.parsed.kernel.name;
+  MODEL = toString hostPlatform.parsed.cpu.bits;
+in
+
+# On linux pargets like `pkgsLLVM.dmd` `cc` does not expose `libgcc`
+# and can't build `dmd`.
+assert hostPlatform.isLinux -> (stdenv.cc.cc ? libgcc);
+stdenv.mkDerivation {
+  pname = "dmd-bootstrap";
+  inherit version;
+
+  src = fetchurl rec {
+    name = "dmd.${version}.${OS}.tar.xz";
+    url = "http://downloads.dlang.org/releases/2.x/${version}/${name}";
+    sha256 = hashes.${OS} or (throw "missing bootstrap sha256 for OS ${OS}");
+  };
+
+  dontConfigure = true;
+  dontBuild = true;
+
+  nativeBuildInputs = lib.optionals hostPlatform.isLinux [
+    autoPatchelfHook
+  ] ++ lib.optionals hostPlatform.isDarwin [
+    fixDarwinDylibNames
+  ];
+  propagatedBuildInputs = [
+    curl
+    tzdata
+  ] ++ lib.optionals hostPlatform.isLinux [
+    glibc
+    stdenv.cc.cc.libgcc
+  ];
+
+  installPhase = ''
+    runHook preInstall
+
+    mkdir -p $out
+
+    # try to copy model-specific binaries into bin first
+    mv ${OS}/bin${MODEL} $out/bin || true
+
+    mv src license.txt ${OS}/* $out/
+
+    # move man into place
+    mkdir -p $out/share
+    mv man $out/share/
+
+    # move docs into place
+    mkdir -p $out/share/doc
+    mv html/d $out/share/doc/
+
+    # fix paths in dmd.conf (one level less)
+    substituteInPlace $out/bin/dmd.conf --replace "/../../" "/../"
+
+    runHook postInstall
+  '';
+
+  # Stripping on Darwin started to break libphobos2.a
+  # Undefined symbols for architecture x86_64:
+  #   "_rt_envvars_enabled", referenced from:
+  #       __D2rt6config16rt_envvarsOptionFNbNiAyaMDFNbNiQkZQnZQq in libphobos2.a(config_99a_6c3.o)
+  dontStrip = hostPlatform.isDarwin;
+
+  meta = with lib; {
+    description = "Digital Mars D Compiler Package";
+    # As of 2.075 all sources and binaries use the boost license
+    license = licenses.boost;
+    maintainers = [ maintainers.lionello ];
+    homepage = "https://dlang.org/";
+    platforms = [ "x86_64-darwin" "i686-linux" "x86_64-linux" ];
+  };
+}
+#+END_SRC
+
+*** versions SET
+**** selected version SET OK ✓
+
+#+NAME: dmd_version
+#+BEGIN_SRC nix
+<<dmd_version_2_106_1>>
+#+END_SRC
+
+#+NAME: dmd_hash
+#+BEGIN_SRC nix
+<<dmd_hash_2_106_1>>
+#+END_SRC
+
+#+NAME: phobos_hash
+#+BEGIN_SRC nix
+<<phobos_hash_2_106_1>>
+#+END_SRC
+
+**** 2.106.1 OK ✓
+
+- nix-prefetch-url --unpack https://github.com/dlang/dmd/archive/refs/tags/v2.106.1.tar.gz
+- nix-prefetch-url --unpack https://github.com/dlang/phobos/archive/refs/tags/v2.106.1.tar.gz
+
+#+NAME: dmd_version_2_106_1
+#+BEGIN_SRC nix
+2.106.1
+#+END_SRC
+
+#+NAME: dmd_hash_2_106_1
+#+BEGIN_SRC nix
+sha256-vjYa/Pxrz7J2htXT+fa+xaeen/Vxne++lELbHTSXBK8=
+#+END_SRC
+
+#+NAME: phobos_hash_2_106_1
+#+BEGIN_SRC nix
+sha256-yRL9ub3u4mREG9PVxBvgQ/LDXD57RadPTZ2h08qyh/s=
+#+END_SRC
+
+**** 2.104.0 KO ✗
+
+- nix-prefetch-url --unpack https://github.com/dlang/dmd/archive/refs/tags/v2.104.0.tar.gz
+- nix-prefetch-url --unpack https://github.com/dlang/phobos/archive/refs/tags/v2.104.0.tar.gz
+
+#+NAME: dmd_version_2_104_0
+#+BEGIN_SRC nix
+2.104.0
+#+END_SRC
+
+#+NAME: dmd_hash_2_104_0
+#+BEGIN_SRC nix
+sha256-yv+uW6cYAId2HK/YSPxsR9Xt0o3LWa97z8KyzjFik6s=
+#+END_SRC
+
+#+NAME: phobos_hash_2_104_0
+#+BEGIN_SRC nix
+sha256-cWp36Gd/lh3gy21bf9z0/RqzlJmf6ypmx72aMeakcec=
+#+END_SRC
+
+**** 2.102.2 KO ✗
+
+- nix-prefetch-url --unpack https://github.com/dlang/dmd/archive/refs/tags/v2.102.2.tar.gz
+- nix-prefetch-url --unpack https://github.com/dlang/phobos/archive/refs/tags/v2.102.2.tar.gz
+
+#+NAME: dmd_version_2_102_2
+#+BEGIN_SRC nix
+2.102.2
+#+END_SRC
+
+#+NAME: dmd_hash_2_102_2
+#+BEGIN_SRC nix
+sha256-der9nb31hJ+K1aJZdzIgs8+eRgVVsH97QnYEnVbKUws=
+#+END_SRC
+
+#+NAME: phobos_hash_2_102_2
+#+BEGIN_SRC nix
+sha256-SracmUm2aY/LDCyDqYuVS39pCbwO8UCL3TSB0CVHpHE=
+#+END_SRC
+
+**** 2.100.2 KO ✗
+
+- nix-prefetch-url --unpack https://github.com/dlang/dmd/archive/refs/tags/v2.100.2.tar.gz
+- nix-prefetch-url --unpack https://github.com/dlang/druntime/archive/refs/tags/v2.100.2.tar.gz
+- nix-prefetch-url --unpack https://github.com/dlang/phobos/archive/refs/tags/v2.100.2.tar.gz
+
+#+NAME: dmd_version_2_100_2
+#+BEGIN_SRC nix
+2.100.2
+#+END_SRC
+
+#+NAME: dmd_hash_2_100_2
+#+BEGIN_SRC nix
+sha256-o4+G3ARXIGObYHtHooYZKr+Al6kHpiwpMIog3i4BlDM=
+#+END_SRC
+
+#+NAME: druntime_hash_2_100_2
+#+BEGIN_SRC nix
+sha256-qXvY1ECN4mPwOGgOE1FWwvxoRvlSww3tGLWgBdhzAKo=
+#+END_SRC
+
+#+NAME: phobos_hash_2_100_2
+#+BEGIN_SRC nix
+sha256-kTHRaAKG7cAGb4IE/NGHWaZ8t7ZceKj03l6E8wLzJzs=
+#+END_SRC
+
+** dub OK
+*** info
+**** links
+
+- https://code.dlang.org/packages/dub
+
+- https://github.com/dlang/dub
+  - https://github.com/dlang/dub/releases
+  - https://github.com/dlang/dub/issues
+
+- version in nixpkgs:
+  - https://search.nixos.org/packages?channel=unstable&show=dub&from=0&size=100&sort=relevance&type=packages&query=dub
+
+**** notes
+
+- OK dub == 1.30.0 OK ✓
+
+- NOTES for dub >= 1.31.0 KO ✗
+  - dub builds test tilix which calls in gtkd
+  - ISSUES dub FAILS to build project from local disk that has built without issue
+    since dub v1.23.0
+    - BROKEN breaks on subproject ends up in nix: Error /homeless-shelter:
+      Permission denied
+
+*** overlays
+**** default.nix OK ✓
+
+#+HEADER: :tangle "../nix-overlays/dub/default.nix"
+#+BEGIN_SRC nix
+{ lib, stdenv, fetchFromGitHub, curl, libevent, rsync, ldc, dcompiler ? ldc }:
+
+assert dcompiler != null;
+
+stdenv.mkDerivation rec {
+  pname = "dub";
+  version = "<<dub_version>>";
+
+  enableParallelBuilding = true;
+
+  src = fetchFromGitHub {
+    owner = "dlang";
+    repo = "dub";
+    rev = "v${version}";
+    sha256 = "<<dub_hash>>";
+  };
+
+  #postUnpack = ''
+  #  patchShebangs .
+  #'';
+
+  dubvar = "\\$DUB";
+  postPatch = ''
+    patchShebangs test
+
+    # Can be removed with https://github.com/dlang/dub/pull/1368
+    substituteInPlace test/fetchzip.sh \
+        --replace "dub remove" "\"${dubvar}\" remove"
+  '';
+
+  nativeBuildInputs = [ dcompiler libevent rsync ];
+  buildInputs = [ curl ];
+
+  buildPhase = ''
+    for DC_ in dmd ldmd2 gdmd; do
+      echo "... check for D compiler $DC_ ..."
+      export DC=$(type -P $DC_ || echo "")
+      if [ ! "$DC" == "" ]; then
+        break
+      fi
+    done
+    if [ "$DC" == "" ]; then
+      exit "Error: could not find D compiler"
+    fi
+    echo "$DC_ found and used as D compiler in buildPhase for $pname"
+    $DC ./build.d
+    ./build
+  '';
+
+  doCheck = !stdenv.isDarwin;
+
+  checkPhase = ''
+    export DUB=$NIX_BUILD_TOP/source/bin/dub
+    export PATH=$PATH:$NIX_BUILD_TOP/source/bin/
+    #export DC=${dcompiler.out}/bin/${if dcompiler.pname=="ldc" then "ldc2" else dcompiler.pname}
+    if [ "$DC" == "" ]; then
+      exit "Error: could not find D compiler"
+    fi
+    echo "DC out --> $DC"
+    export HOME=$TMP
+
+    rm -rf test/issue502-root-import
+    rm -rf test/dpath-variable
+    #rm test/dpath-variable.sh
+    rm -rf test/git-dependency
+    rm -rf test/use-c-sources # added to build v1.33.0
+    rm -rf test/pr2642-cache-db # added to build v1.34.0
+    rm -rf test/pr2644-describe-artifact-path # added to build v1.36.0
+    rm -rf test/pr2647-build-deep # added to build v1.36.0
+
+    ./test/run-unittest.sh
+  '';
+
+  installPhase = ''
+    mkdir -p $out/bin
+    cp bin/dub $out/bin
+  '';
+
+  meta = with lib; {
+    description = "Package and build manager for D applications and libraries";
+    homepage = "https://code.dlang.org/";
+    license = licenses.mit;
+    maintainers = with maintainers; [ jtbx ];
+    platforms = [ "x86_64-linux" "i686-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
+  };
+}
+#+END_SRC
+
+*** versions SET
+**** selected version SET
+
+#+NAME: dub_version
+#+BEGIN_SRC nix
+<<dub_version_1_36_0>>
+#+END_SRC
+
+#+NAME: dub_hash
+#+BEGIN_SRC nix
+<<dub_hash_1_36_0>>
+#+END_SRC
+
+**** 1.36 OK ✓
+***** 1.36.0
+
+- nix-prefetch-url --unpack https://github.com/dlang/dub/archive/refs/tags/v1.36.0.tar.gz
+
+#+NAME: dub_version_1_36_0
+#+BEGIN_SRC nix
+1.36.0
+#+END_SRC
+
+#+NAME: dub_hash_1_36_0
+#+BEGIN_SRC nix
+sha256-S8pls9zxbGAQTwqYf4bDT2q7Ow12S8bBsJE5UmsACBs=
+#+END_SRC
+
+**** 1.35 OK ✓
+***** 1.35.0
+
+- nix-prefetch-url --unpack https://github.com/dlang/dub/archive/refs/tags/v1.35.0.tar.gz
+
+#+NAME: dub_version_1_35_0
+#+BEGIN_SRC nix
+1.35.0
+#+END_SRC
+
+#+NAME: dub_hash_1_35_0
+#+BEGIN_SRC nix
+sha256-hC46XKE6lLLMLGMGl4vDnLDBQy6P/Z7o3ayDJj0Sois=
+#+END_SRC
+
+**** 1.34 OK ✓
+***** 1.34.0
+
+- nix-prefetch-url --unpack https://github.com/dlang/dub/archive/refs/tags/v1.34.0.tar.gz
+
+#+NAME: dub_version_1_34_0
+#+BEGIN_SRC nix
+1.34.0
+#+END_SRC
+
+#+NAME: dub_hash_1_34_0
+#+BEGIN_SRC nix
+sha256-hC46XKE6lLLMLGMGl4vDnLDBQy6P/Z7o3ayDJj0Sois=
+#+END_SRC
+
+**** 1.33 OK ✓
+***** 1.33.1 OK ✓
+
+- nix-prefetch-url --unpack https://github.com/dlang/dub/archive/refs/tags/v1.33.1.tar.gz
+
+#+NAME: dub_version_1_33_1
+#+BEGIN_SRC nix
+1.33.1
+#+END_SRC
+
+#+NAME: dub_hash_1_33_1
+#+BEGIN_SRC nix
+sha256-QFgUsO04VRXBDjGI5QQs7u9XrexG7/V34TMgJP1D8yA=
+#+END_SRC
+
+**** 1.33.0 OK ✓
+
+- nix-prefetch-url --unpack https://github.com/dlang/dub/archive/refs/tags/v1.33.0.tar.gz
+
+#+NAME: dub_version_1_33_0
+#+BEGIN_SRC nix
+1.33.0
+#+END_SRC
+
+#+NAME: dub_hash_1_33_0
+#+BEGIN_SRC nix
+sha256-4Mha7WF6cg3DIccfpvOnheuvgfziv/7wo8iFsPXO4yY=
+#+END_SRC
+
+**** 1.32.1 OK ✓
+
+- nix-prefetch-url --unpack https://github.com/dlang/dub/archive/refs/tags/v1.32.1.tar.gz
+
+#+NAME: dub_version_1_32_1
+#+BEGIN_SRC nix
+1.32.1
+#+END_SRC
+
+#+NAME: dub_hash_1_32_1
+#+BEGIN_SRC nix
+sha256-5pW3Fu3PQ1ZLJnsuh7fPpEBNbVQgGfFyiuMrAVOJKQA=
+#+END_SRC
+
+- ISSUES from 1.31.0 continuing
+
+**** 1.31.1 OK ✓
+
+- nix-prefetch-url --unpack https://github.com/dlang/dub/archive/refs/tags/v1.31.1.tar.gz
+
+#+NAME: dub_version_1_31_1
+#+BEGIN_SRC nix
+1.31.1
+#+END_SRC
+
+#+NAME: dub_hash_1_31_1
+#+BEGIN_SRC nix
+sha256-dp64D51ypowXS1+EYKRXh5hpa3rMmiotvKO2FW+i92w=
+#+END_SRC
+
+- ISSUES from 1.31.0 continuing
+
+**** 1.31.0 OK ✓ NOTE
+
+- nix-prefetch-url --unpack https://github.com/dlang/dub/archive/refs/tags/v1.31.0.tar.gz
+
+behavior change in dub requiring the setting of pwd in buildPhase
+
+#+NAME: dub_version_1_31_0
+#+BEGIN_SRC nix
+1.31.0
+#+END_SRC
+
+#+NAME: dub_hash_1_31_0
+#+BEGIN_SRC nix
+sha256-Ki8HJOfWFM1tF86s7Ng3STgC/uu5acVTP0Dj87M0l54=
+#+END_SRC
+
+- ISSUES from 1.31.0 continuing
+**** 1.30.0 OK ✓
+
+- nix-prefetch-url --unpack https://github.com/dlang/dub/archive/refs/tags/v1.30.0.tar.gz
+
+#+NAME: dub_version_1_30_0
+#+BEGIN_SRC nix
+1.30.0
+#+END_SRC
+
+#+NAME: dub_hash_1_30_0
+#+BEGIN_SRC nix
+sha256-iVl7bjblvIxvrUX7Phq6h4AIAmZjNVkGYYFA1hhsE7c=
+#+END_SRC
+
+**** 1.29.1
+
+- nix-prefetch-url --unpack https://github.com/dlang/dub/archive/refs/tags/v1.29.1.tar.gz
+
+#+NAME: dub_version_1_29_1
+#+BEGIN_SRC nix
+1.29.1
+#+END_SRC
+
+#+NAME: dub_hash_1_29_1
+#+BEGIN_SRC nix
+sha256-XDV9p1bDhRL6gX+nizzjoErNJm8NnQK5O8wNnizloss=
+#+END_SRC
+
+**** 1.28.0
+
+- nix-prefetch-url --unpack https://github.com/dlang/dub/archive/refs/tags/v1.28.0.tar.gz
+
+#+NAME: dub_version_1_28_0
+#+BEGIN_SRC nix
+1.28.0
+#+END_SRC
+
+#+NAME: dub_hash_1_28_0
+#+BEGIN_SRC nix
+sha256-GOeaQyu8Y/DxZEAJPdlGH9ie/ZRTqvAw2jjvM3dESbg=
+#+END_SRC
+
+** dtools OK ✓
+*** info
+**** links
+
+- https://code.dlang.org/packages/dtools
+
+- https://github.com/dlang/tools
+  - https://github.com/dlang/tools/tags
+    nix-prefetch --unpack https://github.com/dlang/tools/archive/refs/tags/v<<dtools_version>>.tar.gz
+  - https://github.com/dlang/tools/issues
+
+- version in nixpkgs
+  - https://search.nixos.org/packages?channel=unstable&show=dtools&from=0&size=100&sort=relevance&type=packages&query=dtools
+
+**** notes
+
+- OK dtools 2.103.1
+
+*** overlays
+**** default.nix
+
+#+HEADER: :tangle "../nix-overlays/dtools/default.nix"
+#+BEGIN_SRC nix
+{ stdenv, lib, fetchFromGitHub, fetchpatch, ldc, curl, gnumake42 }:
+
+stdenv.mkDerivation rec {
+  pname = "dtools";
+  version = "<<dtools_version>>";
+
+  src = fetchFromGitHub {
+    owner = "dlang";
+    repo = "tools";
+    rev = "v${version}";
+    sha256 = "<<dtools_hash>>";
+    name = "dtools";
+  };
+
+  patches = [
+    (fetchpatch {
+      # part of https://github.com/dlang/tools/pull/441
+      url = "https://github.com/dlang/tools/commit/6c6a042d1b08e3ec1790bd07a7f69424625ee866.patch"; # Fix LDC arm64 build
+      sha256 = "sha256-x6EclTYN1Y5FG57KLhbBK0BZicSYcZoWO7MTVcP4T18=";
+    })
+  ];
+
+  nativeBuildInputs = [ ldc gnumake42 ]; # fails with make 4.4
+  buildInputs = [ curl ];
+
+  makeCmd = ''
+    make -f posix.mak all DMD_DIR=dmd DMD=${ldc.out}/bin/ldmd2 CC=${stdenv.cc}/bin/cc
+  '';
+
+  buildPhase = ''
+    $makeCmd
+  '';
+
+  doCheck = true;
+
+  checkPhase = ''
+      $makeCmd test_rdmd
+    '';
+
+  installPhase = ''
+      $makeCmd INSTALL_DIR=$out install
+  '';
+
+  meta = with lib; {
+    description = "Ancillary tools for the D programming language compiler";
+    homepage = "https://github.com/dlang/tools";
+    license = lib.licenses.boost;
+    maintainers = with maintainers; [ ThomasMader ];
+    platforms = lib.platforms.unix;
+  };
+}
+#+END_SRC
+
+*** versions SET
+
+- https://github.com/dlang/tools
+
+**** selected version SET OK ✓
+
+#+NAME: dtools_version
+#+BEGIN_SRC nix
+<<dtools_version_2_103_1>>
+#+END_SRC
+
+#+NAME: dtools_hash
+#+BEGIN_SRC nix
+<<dtools_hash_2_103_1>>
+#+END_SRC
+
+**** 2.103.1 OK ✓
+
+- https://github.com/dlang/tools/releases/tag/v2.103.1
+
+#+NAME: dtools_version_2_103_1
+#+BEGIN_SRC nix
+2.103.1
+#+END_SRC
+
+#+NAME: dtools_hash_2_103_1
+#+BEGIN_SRC nix
+sha256-XM4gUxcarQCOBR8W/o0iWAI54PyLDkH6CsDce22Cnu4=
+#+END_SRC
+
+**** 2.102.2
+
+- https://github.com/dlang/tools/releases/tag/v2.102.2
+
+#+NAME: dtools_version_2_102_2
+#+BEGIN_SRC nix
+2.102.2
+#+END_SRC
+
+#+NAME: dtools_hash_2_102_2
+#+BEGIN_SRC nix
+sha256-XM4gUxcarQCOBR8W/o0iWAI54PyLDkH6CsDce22Cnu4=
+#+END_SRC
+
+**** 2.095.1 current nixpkgs 20-03-17 OK ✓
+
+- https://github.com/dlang/tools/releases/tag/v2.095.1
+
+#+NAME: dtools_version_2_095_1
+#+BEGIN_SRC nix
+2.095.1
+#+END_SRC
+
+#+NAME: dtools_hash_2_095_1
+#+BEGIN_SRC nix
+sha256:0rdfk3mh3fjrb0h8pr8skwlq6ac9hdl1fkrkdl7n1fa2806b740b
+#+END_SRC
+
+** sha256 blank_hash
+
+#+NAME: sha256-blank
+#+BEGIN_SRC nix
+sha256-0000000000000000000000000000000000000000000=
+#+END_SRC
+
+#+NAME: blank_hash
+#+BEGIN_SRC nix
+sha256-0000000000000000000000000000000000000000000=
+#+END_SRC
+
+#+NAME: assumed_hash
+#+BEGIN_SRC nix
+sha256-AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=
+#+END_SRC