nixpkgs/pkgs/development/compilers/ghc/with-packages.nix

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{ stdenv, ghc, packages, buildEnv, makeWrapper }:
assert packages != [];
let
ghc761OrLater = stdenv.lib.versionOlder "7.6.1" ghc.version;
packageDBFlag = if ghc761OrLater then "--package-db" else "--package-conf";
libDir = "$out/lib/ghc-${ghc.version}";
packageCfgDir = "${libDir}/package.conf.d";
in
buildEnv {
name = "haskell-env-${ghc.name}";
paths = stdenv.lib.filter (x: x ? ghc) (stdenv.lib.closePropagation packages) ++ [ghc];
postBuild = ''
. ${makeWrapper}/nix-support/setup-hook
for prg in ghc ghci ghc-${ghc.version} ghci-${ghc.version}; do
rm -f $out/bin/$prg
makeWrapper ${ghc}/bin/$prg $out/bin/$prg \
--add-flags '"-B$NIX_GHC_LIBDIR"' \
--set "NIX_GHC" "$out/bin/ghc" \
--set "NIX_GHCPKG" "$out/bin/ghc-pkg" \
--set "NIX_GHC_LIBDIR" "${libDir}"
done
for prg in runghc runhaskell; do
rm -f $out/bin/$prg
makeWrapper ${ghc}/bin/$prg $out/bin/$prg \
--add-flags "-f $out/bin/ghc" \
--set "NIX_GHC" "$out/bin/ghc" \
--set "NIX_GHCPKG" "$out/bin/ghc-pkg" \
--set "NIX_GHC_LIBDIR" "${libDir}"
done
for prg in ghc-pkg ghc-pkg-${ghc.version}; do
rm -f $out/bin/$prg
makeWrapper ${ghc}/bin/$prg $out/bin/$prg --add-flags "${packageDBFlag} ${packageCfgDir}"
done
$out/bin/ghc-pkg recache
'';
}