{ useClang ? false }: with import (builtins.fetchTarball https://github.com/NixOS/nixpkgs-channels/archive/nixos-19.03.tar.gz) {}; with import ./release-common.nix { inherit pkgs; }; (if useClang then clangStdenv else stdenv).mkDerivation { name = "nix"; buildInputs = buildDeps ++ tarballDeps ++ perlDeps; inherit configureFlags; enableParallelBuilding = true; installFlags = "sysconfdir=$(out)/etc"; shellHook = '' export prefix=$(pwd)/inst configureFlags+=" --prefix=$prefix" PKG_CONFIG_PATH=$prefix/lib/pkgconfig:$PKG_CONFIG_PATH PATH=$prefix/bin:$PATH ''; }