Update how we detect if libc5 is in use.
 -Erik
diff --git a/logread.c b/logread.c
index 19e8aef..d334962 100644
--- a/logread.c
+++ b/logread.c
@@ -35,9 +35,7 @@
 #include <setjmp.h>
 #include "busybox.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
 #error Sorry.  Looks like you are using libc5.  
 #error libc5 shm support isnt good enough.
 #error Please disable BB_FEATURE_IPC_SYSLOG