--- ./ext/standard/php_crypt_r.c.orig
+++ ./ext/standard/php_crypt_r.c
@@ -94,7 +94,7 @@
 	if (!initialized) {
 #ifdef PHP_WIN32
 		InterlockedIncrement(&initialized);
-#elif (defined(__GNUC__) && (__GNUC__ >= 4 && __GNUC_MINOR__ >= 2))
+#elif (defined(__GNUC__) && (__GNUC__ >= 4 && __GNUC_MINOR__ >= 2)) || defined(__UCLIBC__)
 		__sync_fetch_and_add(&initialized, 1);
 #elif defined(HAVE_ATOMIC_H) /* Solaris 10 defines atomic API within */
 		membar_producer();