See bug #938613
--- a/dog.c
+++ b/dog.c
@@ -77,9 +77,11 @@
 #endif
 
 #if ALLOW_LINUX_EXTENSIONS
+#if defined(__GLIBC__)
 #define ALLOW_STRFRY			1
 extern char *strfry __P ((char *__string));
 #else
+#endif
 #define ALLOW_STRFRY			0
 #endif