anchor.diff:  
     system-config-printer = callPackage ../tools/misc/system-config-printer {
       libxml2 = libxml2Python;
  +    pythonPackages = python3Packages;
      };
   
     sitecopy = callPackage ../tools/networking/sitecopy { };
  
positive.code: 
    stlport = callPackage ../development/libraries/stlport { };
  
    streamlink = callPackage ../applications/video/streamlink {};
  
    strigi = callPackage ../development/libraries/strigi { clucene_core = clucene_core_2; };
  
  
negative.code: 
    blender = callPackage  ../applications/misc/blender {
      cudatoolkit = cudatoolkit75;
      python = python35;
    };
  
    bluefish = callPackage ../applications/editors/bluefish {
  