with import <nixpkgs> {}; {
  cgEnv = llvmPackages.libcxxStdenv.mkDerivation rec {
    name = "my-gcc8-environment";
    myghc = haskellPackages.ghcWithPackages
      (pkgs: with pkgs;
        [ shake shake-language-c ]
      );

    buildInputs = [
        # external libs
        glm
        glfw3
        glew
        mesa_glu
        mesa_drivers
        libGL_driver

        # compiler
        llvmPackages.libstdcxxClang

        pkgconfig

        # build
        myghc
        zlib
    ];
  };
}