anchor.diff:    else
       "";
   
  -  doCheck = !bootstrapVersion && !stdenv.isDarwin;
  +  doCheck = !bootstrapVersion;
   
     checkPhase = stdenv.lib.optionalString doCheck ''
       # Build default lib test runners
  
positive.code: { stdenv, fetchurl, cmake, ninja, llvm, llvm_8, curl, tzdata
  , python, libconfig, lit, gdb, unzip, darwin, bash
  , callPackage, makeWrapper, targetPackages
  , bootstrapVersion ? false
  
negative.code:   ]
  
    ++ stdenv.lib.optional (bootstrapVersion) [
      libconfig llvm_5
    ]
  
    ++ stdenv.lib.optional stdenv.hostPlatform.isDarwin (with darwin.apple_sdk.frameworks; [
  