anchor.diff:      description = "HTTP client library based on APR";
       license = stdenv.lib.licenses.asl20;
       maintainers = [stdenv.lib.maintainers.raskin];
  -    hydraPlatforms = stdenv.lib.platforms.linux ++ stdenv.lib.platforms.darwin;
  +    hydraPlatforms = stdenv.lib.platforms.linux;
     };
   }
  
positive.code:     scons PREFIX="$out" OPENSSL="${openssl}" ZLIB="${zlib}" APR="$(echo "${apr}"/bin/*-config)" \
          APU="$(echo "${aprutil}"/bin/*-config)" CC="${
            if stdenv.cc.isClang then "clang" else "${stdenv.cc}/bin/gcc"
          }" ${
            if (stdenv.isDarwin || stdenv.isCygwin) then "" else "GSSAPI=\"${kerberos}\""
          }
    '';
  
    NIX_CFLAGS_COMPILE = stdenv.lib.optionalString stdenv.isDarwin "-L/usr/lib";
  
    installPhase = ''
      scons install
  
negative.code:   };
  
    buildInputs = [ apr scons openssl aprutil zlib ]
      ++ stdenv.lib.optional true kerberos;
  
    configurePhase = ''
      ${gnused}/bin/sed -e '/^env[.]Append(BUILDERS/ienv.Append(ENV={"PATH":os.environ["PATH"]})' -i SConstruct
  