anchor.diff:      url = "mirror://sourceforge/glew/${name}.tgz";
       sha256 = "1iwb2a6wfhkzv6fa7zx2gz1lkwa0iwnd9ka1im5vdc44xm4dq9da";
     };
  +
  +  outputs = [ "bin" "out" "dev" "doc" ];
   
     nativeBuildInputs = [ xlibsWrapper libXmu libXi ];
     propagatedNativeBuildInputs = [ mesa_glu ]; # GL/glew.h includes GL/glu.h
  
positive.code:     mkdir -p $out/lib/pkgconfig
      cp glew*.pc $out/lib/pkgconfig
      cp -r README.txt LICENSE.txt doc $out/share/doc/glew
    '';
  
    crossAttrs.makeFlags = [
  
negative.code:   installFlags = [ "install.all" ];
  
    preInstall = ''
      makeFlagsArray+=(GLEW_DEST=$out BINDIR=$bin/bin INCDIR=$dev/include/GL)
    '';
  
    postInstall = ''
  