anchor.diff:    llvm-polly = llvmPackages_latest.llvm-polly;
     clang-polly = llvmPackages_latest.clang.override { cc = llvmPackages_latest.clang-polly-unwrapped; };
   
  +  clang_9  = llvmPackages_9.clang;
     clang_8  = llvmPackages_8.clang;
     clang_7  = llvmPackages_7.clang;
     clang_6  = llvmPackages_6.clang;
  
positive.code:     stdenv = gcc6Stdenv; # with gcc-7: undefined reference to `__divmoddi4'
    });
  
    llvmPackages_latest = llvmPackages_8;
  
    lorri = throw "lorri is not stable yet. Please go to https://github.com/target/lorri and follow the installation instructions there, for the time being.";
  
  
negative.code:   lldb_6 = llvmPackages_6.lldb;
    lldb_7 = llvmPackages_7.lldb;
    lldb_8 = llvmPackages_8.lldb;
    lldb_9 = llvmPackages_9.lldb;
  
    llvm = llvmPackages.llvm;
    llvm-manpages = llvmPackages.llvm-manpages;
  
    llvm_9  = llvmPackages_9.llvm;
    llvm_8  = llvmPackages_8.llvm;
    llvm_7  = llvmPackages_7.llvm;
    llvm_6  = llvmPackages_6.llvm;
  