--- liblangtag/lt-macros.h
+++ liblangtag/lt-macros.h
@@ -120,7 +120,7 @@
  * It allows the compiler to type-check the arguments passed to the function.
  * See the GNU C documentation for details.
  */
-#if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ > 4)
+#if (defined __GNUC__ && (__GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ > 4))) || defined __clang__
 #  define LT_GNUC_PRINTF(format_idx, arg_idx)	\
 	__attribute__((__format__ (__printf__, format_idx, arg_idx)))
 #else /* !__GNUC__ */
@@ -136,7 +136,7 @@
  * explicit %NULL.
  * See the GNU C documentation for details.
  */
-#if __GNUC__ >= 4
+#if (defined __GNUC__ &&__GNUC__ >= 4) || defined __clang__
 #  define LT_GNUC_NULL_TERMINATED		\
 	__attribute__((__sentinel__))
 #else /* !__GNUC__ */