anchor.diff:    cmakeFlags = [
       "-DLLVM_OCAML_OUT_OF_TREE=TRUE"
       "-DLLVM_OCAML_INSTALL_PATH=${placeholder "out"}/ocaml"
  +    "-DLLVM_OCAML_EXTERNAL_LLVM_LIBDIR=${stdenv.lib.getLib llvm}/lib"
     ];
   
     buildFlags = "ocaml_all";
  
positive.code: 
    inherit (llvm) src;
  
    buildInputs = [ python cmake llvm ocaml findlib ctypes ];
  
    patches = [ (fetchpatch {
      url = https://raw.githubusercontent.com/ocaml/opam-repository/2bdc193f5a9305ea93bf0f0dfc1fbc327c8b9306/packages/llvm/llvm.7.0.0/files/fix-shared.patch;
  
negative.code:     mv $OCAMLFIND_DESTDIR/llvm/META{.llvm,}
    '';
  
    passthru = {
      inherit llvm;
    };
  
    meta = {
      inherit (llvm.meta) license homepage;
      platforms = ocaml.meta.platforms or [];
  