Julia Linux

default.nix

let
  pkgs = import <nixpkgs> {};
  buildJulia = version: sha256:
    with pkgs;
    gcc7Stdenv.mkDerivation {
      makeFlags = [
        "ARCH=x86_64"
        "MARCH=x86-64"
        "JULIA_CPU_TARGET=x86-64"
        "USE_BINARYBUILDER=0"
        "PREFIX=$(out)"
        "prefix=$(out)"
        "OS=Linux"
      ];
      name = "julia-${version}";
      patches = [
        (fetchurl {
          url =
            "https://raw.githubusercontent.com/NixOS/nixpkgs/9fa09748565e917f80db47006ecec48489cdb603/pkgs/development/compilers/julia/allow_nix_mtime.patch";
          sha256 = "0r4zlrk1jxz0jghb3l0ry3lzqf0ddbp0c4s8qs1vhwk43b73w459";
        })
      ];
      src = pkgs.fetchzip {
        url =
          "https://github.com/JuliaLang/julia/releases/download/v${version}/julia-${version}-full.tar.gz";
        inherit sha256;
      };
      enableParallelBuilding = true;
      buildInputs = [ m4 python gfortran which perl ];
      doCheck = false;
      NIX_CFLAGS_COMPILE = if stdenv.isLinux then "-L${gfortran.cc.lib}/lib" else null;
      separateDebugInfo = true;
      preConfigure = ''
        export PATH=$PATH:${cmake}/bin
        sed -e '/^install:/s@[^ ]*/doc/[^ ]*@@' -i Makefile
        sed -e '/[$](DESTDIR)[$](docdir)/d' -i Makefile
      '';
    };
in {
  julia_142 = buildJulia "1.4.2" "14jghi9mw0wdi6y9saarf0nzary9i21jx43zznddzrq48v4nlayj";
}

I think the gcc7Stdenv was necessary due to compatibility with the BinaryBuilder artifacts that gets downloaded by the Julia package manager.