{ pkgs }:

rec {
  optimizeWithFlag = pkg: flag:
    pkg.overrideAttrs (attrs: {
      NIX_CFLAGS_COMPILE = (attrs.NIX_CFLAGS_COMPILE or "") + " ${flag}";
    });

  optimizeWithFlags = pkg: flags:
    pkgs.lib.foldl' (pkg: flag: optimizeWithFlag pkg flag) pkg flags;

  optimizeForThisHost = pkg:
    optimizeWithFlags pkg [ "-O3" "-march=native" "-fPIC" ];

  withDebuggingCompiled = pkg:
    optimizeWithFlag pkg "-DDEBUG";

  applyOptimizations = opts: pkg:
    pkgs.lib.foldl (pkg: optfun: optfun pkg) pkg opts;

  withoutConfigureFlag = flag: pkg:
    pkgs.lib.overrideDerivation pkg (old: {
      configureFlags = pkgs.lib.filter (x: x != flag) old.configureFlags;
    });

}