anchor.diff:      inherit (python2Packages) python;
     } // lib.optionalAttrs stdenv.isLinux {
       # doesn't build with gcc7
  -    stdenv = overrideCC stdenv gcc6;
  +    stdenv = overrideCC stdenv buildPackages.gcc6;
     };
   
     vaapiIntel = callPackage ../development/libraries/vaapi-intel { };
  
positive.code: 
    calf = callPackage ../applications/audio/calf {
        inherit (gnome2) libglade;
        stdenv = overrideCC stdenv gcc5;
    };
  
    calcurse = callPackage ../applications/misc/calcurse { };
  
negative.code:   openfx = callPackage ../development/libraries/openfx {};
  
    openimageio = callPackage ../applications/graphics/openimageio {
      stdenv = overrideCC stdenv buildPackages.gcc6;
    };
  
    openimageio2 = callPackage ../applications/graphics/openimageio/2.x.nix { };
  