This fixes the undefined llvm_flag error when the --last-stable option is called. I added a download_llvm_binary function call, which sets the llvm_flags.

Author: saisoma123

interpreter/cling/tools/packaging/cpt.py

@@ -2252,6 +2252,7 @@ def custom_input(prompt, always_yes=False):
     args["with_binary_llvm"] = True
 
     if args["with_binary_llvm"]:
+        download_llvm_binary()
         compile = compile_for_binary
         install_prefix = install_prefix_for_binary
         fetch_clang(llvm_revision)