anchor.diff:          awk --version
           grep --version
           gcc --version
  -
  -        ${build}/in-nixpkgs/sh -c 'echo Hello World'
  +        curl --version
   
           ldlinux=$(echo ${unpack}/lib/ld-linux*.so.2)
   
  
positive.code:         cp -d ${gnumake}/bin/* $out/bin
          cp -d ${patch}/bin/* $out/bin
          cp ${patchelf}/bin/* $out/bin
  
          cp -d ${gnugrep.pcre}/lib/libpcre*.so* $out/lib # needed by grep
  
  
negative.code: 
          echo '#include <stdio.h>' >> foo.c
          echo '#include <limits.h>' >> foo.c
          echo 'int main() { printf("Hello World\\n"); return 0; }' >> foo.c
          $CC -o $out/bin/foo foo.c
          $out/bin/foo
  
          echo '#include <iostream>' >> bar.cc
          echo 'int main() { std::cout << "Hello World\\n"; }' >> bar.cc
          $CXX -v -o $out/bin/bar bar.cc
          $out/bin/bar
  
  