CODEWITHSUNDEEP
nix
trupanka
trupanka

Reputation: 703

How to customize a <nixpkgs> package configureFlags

I need to modify configureFlags of pcre package from <nixpkgs>. I've tried to do it with .nixpkgs/config.nix file as described here:

{
  packageOverrides = pkgs: rec {
    pcre = pkgs.pcre.overrideDerivation (attrs: {
      configureFlags = [
        "--disable-jit"
        "--enable-unicode-properties"
        "--disable-cpp"
      ];
      doCheck = "";
    });
  };
}

But it doesn't work. When I run nix-build -p pcre it builds the package twice: with --disable-jit and with --enable-jit. When I run nix-build -p stdenv customizations in config.nix are ignored.

Upvotes: 2

Views: 1335

Answers (1)

danbst
danbst

Reputation: 3643

stdenv is special in that it is used to build "normal" packages (and you are overriding pcre as "normal" package). So, to make customizations work, you have to patch stdenv!

For example, you can use one of the functions from adapters.

If you want to embed pcre more deeply, you have to look into staged stdenv building

Upvotes: 2

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