anchor.diff:  
   # Optionals
   , cliSupport ? true # Build standalone CLI application
  -, unittestsSupport ? true # Unit tests
  +, unittestsSupport ? false # Unit tests
   # Debugging options
   , debugSupport ? false # Run-time sanity checks (debugging)
   , werrorSupport ? false # Warnings as errors
  -, ppaSupport ? false # PPA profiling instrumentation
  -, vtuneSupport ? false # Vtune profiling instrumentation
   , custatsSupport ? false # Internal profiling of encoder work
   }:
   
  
positive.code:     ];
  
      postInstall =
      /* Remove unused files to prevent conflicts with
         pkg-config/libtool hooks */ ''
        rm -rvf $out/includes
        rm -rvf $out/lib/pkgconfig
      '' +
      /* Rename the library to a unique name */ ''
        mv -v $out/lib/libx265.a $out/lib/libx265_main10.a
      '';
    };
    libx265-12 = stdenv.mkDerivation {
      name = "libx265-12-${version}";
  
negative.code:     sha256 = "1j0mbcf10aj6zi1nxql45f9817jd2ndcpd7x123sjmyr7q9m8iiy";
    };
    cmakeFlagsAll = [
      (cmFlag "ENABLE_TESTS" false)
      (cmFlag "ENABLE_AGGRESSIVE_CHECKS" false)
      (cmFlag "CHECKED_BUILD" debugSupport)
      (cmFlag "WARNINGS_AS_ERRORS" false)
      (cmFlag "ENABLE_PPA" false)
      (cmFlag "ENABLE_VTUNE" false)
      (cmFlag "ENABLE_PIC" true)
      (cmFlag "ENABLE_LIBNUMA" (
        (elem targetSystem platforms.linux)
  