Use the compiler MacPorts said to use.
--- tools/getcompiler.sh.orig	2019-03-04 16:32:44.000000000 -0600
+++ tools/getcompiler.sh	2019-10-08 11:46:00.000000000 -0500
@@ -20,7 +20,7 @@
 # extended functionality, don't try and select another compiler.
 
 case "$CC" in
-	*"stack-master"*|*"afl-clang"*|*"afl-gcc"*|*"hfuzz-clang"*|*"ccc-analyzer"*)
+	*)
 		echo "$CC" ;
 		exit 0 ;
 esac