diff --git a/configure.in b/configure.in
index f8f3e03b..0b5cabc2 100644
--- a/configure.in
+++ b/configure.in
@@ -559,7 +559,7 @@ AM_CONDITIONAL(OPENSSL, [test "$enable_openssl" != "no" && test "$have_openssl"
 
 # Add some more warnings which we use in development but not in the
 # released versions.  (Some relevant gcc versions can't handle these.)
-if test x$enable_gcc_warnings = xyes; then
+if test x$enable_gcc_warnings = xyes && test "$GCC" = "yes"; then
 
   AC_COMPILE_IFELSE(AC_LANG_PROGRAM([], [
 #if !defined(__GNUC__) || (__GNUC__ < 4)