anchor.diff:  
     palemoon = callPackage ../applications/networking/browsers/palemoon {
       # https://forum.palemoon.org/viewtopic.php?f=57&t=15296#p111146
  -    stdenv = overrideCC stdenv buildPackages.gcc49;
  +    stdenv = gcc49Stdenv;
     };
   
     pamix = callPackage ../applications/audio/pamix { };
  
positive.code:   openfx = callPackage ../development/libraries/openfx {};
  
    openimageio = callPackage ../applications/graphics/openimageio {
      stdenv = overrideCC stdenv buildPackages.gcc6;
    };
  
    openimageio2 = callPackage ../applications/graphics/openimageio/2.x.nix { };
  
negative.code: 
    opal = callPackage ../development/libraries/opal {
      ffmpeg = ffmpeg_2;
      stdenv = gcc6Stdenv;
    };
  
    openh264 = callPackage ../development/libraries/openh264 { };
  