anchor.diff:  
     pango = callPackage ../development/libraries/haskell/pango {
       inherit (pkgs.gtkLibs) pango;
  +    glibc = if pkgs.stdenv.isDarwin then null else pkgs.glibc;
     };
   
     parallel_1_1_0_1 = callPackage ../development/libraries/haskell/parallel/1.1.0.1.nix {};
  
positive.code: 
    glib = callPackage ../development/libraries/haskell/glib {
      glib = pkgs.glib;
    };
  
    GlomeVec = callPackage ../development/libraries/haskell/GlomeVec {};
  
negative.code: 
    cairo = callPackage ../development/libraries/haskell/cairo {
      inherit (pkgs) cairo zlib;
      glibc = if pkgs.stdenv.isDarwin then null else pkgs.glibc;
    };
  
    caseInsensitive_0_3 = callPackage ../development/libraries/haskell/case-insensitive/0.3.nix {};
  