gistfile1.txt

with import <nixpkgs> {};

let
  glibc = pkgs.glibc;
  wrapGCCWith = gccWrapper: glibc: baseGCC: gccWrapper {
    nativeTools = stdenv.cc.nativeTools or false;
    nativeLibc = stdenv.cc.nativeLibc or false;
    nativePrefix = stdenv.cc.nativePrefix or "";
    gcc = baseGCC;
    libc = glibc;
    inherit stdenv binutils coreutils zlib;
  };

  wrapGCC = wrapGCCWith (makeOverridable (import <nixpkgs/pkgs/build-support/gcc-wrapper>)) glibc;
in
wrapGCC (pkgs.gcc49.gcc.override {
   name = "gccgo";
   langCC = true; #required for go.
   langC = true;
   langGo = true;
 })