anchor.diff:      name = name + (if src ? version then "-" + src.version else "");
     
       postHook = ''
  -      mkdir -p $out/nix-support
  -      echo "$system" > $out/nix-support/system
  -
  -      if test -z "${toString doCoverageAnalysis}"; then
  -          echo "nix-build none $out" >> $out/nix-support/hydra-build-products
  -      fi
  -
         # If `src' is the result of a call to `makeSourceTarball', then it
         # has a subdirectory containing the actual tarball(s).  If there are
         # multiple tarballs, just pick the first one.
  
positive.code: , src, stdenv
  , name ? if doCoverageAnalysis then "nix-coverage" else "nix-build"
  , failureHook ? null
  , postPhases ? []
  , ... } @ args:
  
  
negative.code:           export CFLAGS="-O0"
            export CXXFLAGS="-O0"
        fi
      ''; # */
  
      initPhase = ''
        mkdir -p $out/nix-support
        echo "$system" > $out/nix-support/system
  
        if test -z "${toString doCoverageAnalysis}"; then
            echo "nix-build none $out" >> $out/nix-support/hydra-build-products
        fi
      '';
  
      prePhases = ["initPhase"] ++ prePhases;
  
      # In the report phase, create a coverage analysis report.
      coverageReportPhase = if doCoverageAnalysis then ''
  