Index: tls/build.sh
==================================================================
--- tls/build.sh
+++ tls/build.sh
@@ -54,11 +54,11 @@
 		cp -rp ../buildsrc/* './'
 	fi
 
 	# Determine SSL directory
 	if [ -z "${CPP}" ]; then
-		CPP="${CC} -E"
+		CPP="${CC:-cc} -E"
 	fi
 
 	if [ -n "${KC_TLS_SSLDIR}" ]; then
 		SSLDIR="${KC_TLS_SSLDIR}"
 	else