anchor.diff:      --enable-mem-cache
     '';
   
  -  preConfigure =
  -    ''
  -      makeFlagsArray+=("installbuilddir=$dev/share/build")
  -    '';
  -
     enableParallelBuilding = true;
   
     stripDebugList = "lib modules bin";
  
positive.code: 
    # Required for ‘pthread_cancel’.
    NIX_LDFLAGS = (if stdenv.isDarwin then "" else "-lgcc_s");
  
    configureFlags = ''
      --with-z=${zlib}
  
negative.code:     sha256 = "1b165zi7jrrlz5wmyy3b34lcs3dl4g0dymfb0qxwdnimylcrsbzk";
    };
  
    # FIXME: -dev depends on -doc
    outputs = [ "dev" "out" "doc" ];
  
    buildInputs = [ pkgconfig perl apr aprutil pcre zlib ] ++
  