setroot: fix build

pkgs/tools/X11/setroot/default.nix

@@ -1,9 +1,7 @@
-{ lib, stdenv, fetchFromGitHub, libX11, imlib2
-, enableXinerama ? true, libXinerama ? null
+{ lib, stdenv, fetchFromGitHub, libX11, imlib2, pkg-config, fetchpatch
+, enableXinerama ? true, libXinerama
 }:
 
-assert enableXinerama -> libXinerama != null;
-
 stdenv.mkDerivation rec {
   version = "2.0.2";
   pname = "setroot";
@@ -15,12 +13,21 @@ stdenv.mkDerivation rec {
     sha256 = "0w95828v0splk7bj5kfacp4pq6wxpyamvyjmahyvn5hc3ycq21mq";
   };
 
+  patches = [
+    (fetchpatch {
+      url = "https://github.com/ttzhou/setroot/commit/d8ff8edd7d7594d276d741186bf9ccf0bce30277.patch";
+      sha256 = "sha256-e0iMSpiOmTOpQnp599fjH2UCPU4Oq1VKXcVypVoR9hw=";
+    })
+  ];
+
+  nativeBuildInputs = [ pkg-config ];
+
   buildInputs = [ libX11 imlib2 ]
-    ++ lib.optional enableXinerama libXinerama;
+    ++ lib.optionals enableXinerama [ libXinerama ];
 
-  buildFlags = [ "CC=${stdenv.cc.targetPrefix}cc" (if enableXinerama then "xinerama=1" else "xinerama=0") ] ;
+  buildFlags = [ (if enableXinerama then "xinerama=1" else "xinerama=0") ] ;
 
-  installFlags = [ "DESTDIR=$(out)" "PREFIX=" ];
+  installFlags = [ "PREFIX=$(out)" ];
 
   meta = with lib; {
     description = "Simple X background setter inspired by imlibsetroot and feh";