shell.nix

derivation {
    name = "shell";
    builder = "${nixpkgs.coreutils}/bin/false";  # Only for use with nix-shell.
    system = nixpkgs.system;
    stdenv = nixpkgs.writeTextDir "setup" ''
        export PATH=${
            nixpkgs.lib.concatStringsSep ":" [
                "${nixpkgs.cmake}/bin"
                "${nixpkgs.coreutils}/bin"
                "${nixpkgs.gcc}/bin"  # Does not get unwanted flags!
                "${nixpkgs.pkg-config}/bin"
            ]
        }
        export PKG_CONFIG_PATH=${
            nixpkgs.lib.concatStringsSep ":" [
                "${nixpkgs.SDL2.dev}/lib/pkgconfig"
                "${nixpkgs.freetype.dev}/lib/pkgconfig"
            ]
        }
    '';
}