--- configure.ac.orig	2021-03-02 19:58:06 UTC
+++ configure.ac
@@ -816,7 +816,7 @@ if test x$enable_debug = xyes ; then
 else
     if test "$GCC" = yes ; then
 	case "`$CC --version 2>&1`" in
-	    *LLVM*|lcc*|clang*)
+	    *LLVM*|lcc*|*clang*)
 		# Apple LLVM and MCST LCC falsely claim to be GCC
 		;;
 	    *)