anchor.diff:  
     libEnvVar = stdenv.lib.optionalString stdenv.hostPlatform.isDarwin "DY"
       + "LD_LIBRARY_PATH";
  +
  +  glibcDynLinker = assert stdenv.isLinux;
  +    if stdenv.hostPlatform.libc == "glibc" then
  +       stdenv.cc.bintools.dynamicLinker
  +    else
  +      "${stdenv.lib.getLib glibc}/lib/ld-linux*";
   
   in
   
  
positive.code:       find . -type f -perm -0100 -exec patchelf \
            --replace-needed libncurses${stdenv.lib.optionalString stdenv.is64bit "w"}.so.5 libncurses.so \
            --replace-needed libtinfo.so libtinfo.so.5 \
            --interpreter "$(cat $NIX_CC/nix-support/dynamic-linker)" {} \;
  
        paxmark m ./ghc-${version}/ghc/stage2/build/tmp/ghc-stage2
  
  
negative.code: { stdenv
  , fetchurl, perl, gcc, llvm_39
  , ncurses5, gmp, glibc, libiconv
  }:
  
  # Prebuilt only does native
  