anchor.diff:  
     buildInputs = [
       boost
  -    llvmPackages_4.llvm
  -    llvmPackages_4.clang
  -    llvmPackages_4.clang-unwrapped
  +    llvmPackages_5.llvm
  +    llvmPackages_5.clang
  +    llvmPackages_5.clang-unwrapped
       gmp
       emacs25-nox
       jre_headless
  
positive.code: , makeWrapper
  , boost
  , llvmPackages
  , llvmPackages_4
  , gmp
  , emacs
  , emacs25-nox
  
negative.code:     "-DCMAKE_C_COMPILER=${llvmPackages.clang}/bin/clang"
      "-DBoost_USE_STATIC_LIBS=OFF"
      "-DMOZART_BOOST_USE_STATIC_LIBS=OFF"
      "-DCMAKE_PROGRAM_PATH=${llvmPackages_5.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.
  