anchor.diff:        "-Wno-error=bool-compare"
         "-Wno-error=deprecated-declarations"
         "-DOBJDUMP_PATH=\"${binutils}/bin/objdump\""
  +      "-DTIPDIR=\"$(out)/share/doc/perf-tip\""
       ]
       # gcc before 6 doesn't know these options
       ++ stdenv.lib.optionals (hasPrefix "gcc-6" stdenv.cc.cc.name) [
  
positive.code: stdenv.mkDerivation {
    name = "perf-linux-${kernel.version}";
  
    inherit (kernel) src makeFlags;
  
    preConfigure = ''
      cd tools/perf
  
negative.code:     ];
  
    separateDebugInfo = true;
    installFlags = "install install-man ASCIIDOC8=1 prefix=$(out)";
  
    preFixup = ''
      wrapProgram $out/bin/perf \
  