Hi, all,

I’m enjoying my time with NixOS so far, but I’m having a devil of a time 
building a patched version of the dwm window manager. I’ve been able to 
successfully apply the dwm+pango patch, by adding the following to 
configuration.nix:

  nixpkgs.config.dwm = { patches = let pp = pkgs.fetchurl {
                                              url = 
"http://dwm.suckless.org/patches/dwm-6.0-pango.diff";;
                                              sha256 = 
"3bd45a8b4e28258002ffa2f62f5dece7913ef476ea76e2eb6d3d85817ac8cc9e";
                                            };
                                   in
                                     [pp]; };

This applies the patch correctly, but then dwm fails to build; it needs 
pkgconfig, libXft, and pango in addition to the dependencies declared in the 
dwm/default.nix expression. So I’ve overridden the buildInputs as such:

  environment.systemPackages = with pkgs; [
      # stuff elided ...
      (lib.overrideDerivation dwm (attrs: { buildInputs = attrs.buildInputs ++ 
[xlibs.libXft xlibs.libXinerama pango pkgconfig]; }))
  ];

OK, this now seems to pull in the required libraries; but now, the build error 
is that the pkg_config binary (which gets called in the patched Makefile) can’t 
find any of the .pc files. I’m not 100% sure how to proceed here; I was 
operating under the assumption that having pkgconfig in the buildInputs would 
ensure that the various paths are correctly setup in the PKG_CONFIG_PATH. Is 
there something obvious I’m missing, here?

Thanks in advance! 
jfb

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