anchor.diff:  , makeWrapper
   , boost
   , llvmPackages
  -, llvmPackages_4
  +, llvmPackages_5
   , gmp
   , emacs
   , emacs25-nox
  
positive.code:     "-DCMAKE_C_COMPILER=${llvmPackages.clang}/bin/clang"
      "-DBoost_USE_STATIC_LIBS=OFF"
      "-DMOZART_BOOST_USE_STATIC_LIBS=OFF"
      "-DCMAKE_PROGRAM_PATH=${llvmPackages_4.clang}/bin"
      # Rationale: Nix's cc-wrapper needs to see a compile flag (like -c) to
      # infer that it is not a linking call, and stop trashing the command line
      # with linker flags.
  
negative.code: 
    buildInputs = [
      boost
      llvmPackages_5.llvm
      llvmPackages_5.clang
      llvmPackages_5.clang-unwrapped
      gmp
      emacs25-nox
      jre_headless
  