Update how we detect if libc5 is in use.
-Erik
diff --git a/include/libbb.h b/include/libbb.h
index 0001cac..6133b19 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -34,9 +34,8 @@
#endif
#include <features.h>
-/* Stupid libc doesn't have a reliable way for use to know
- * that libc5 is being used. Assume this is good enough */
-#if ! defined __GLIBC__ && ! defined __UCLIBC__
+
+#if __GNU_LIBRARY__ < 5
/* libc5 doesn't define socklen_t */
typedef unsigned int socklen_t;
/* libc5 doesn't implement BSD 4.4 daemon() */