gentoo-overlay/dev-libs/libnl/files/libnl-1.1.3-offsetof.patch

--- a/include/netlink-local.h
+++ b/include/netlink-local.h
@@ -343,7 +343,9 @@
 }
 
 #define ARRAY_SIZE(X) (sizeof(X) / sizeof((X)[0]))
+#ifndef offsetof
 #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
+#endif
 
 #define __init __attribute__ ((constructor))
 #define __exit __attribute__ ((destructor))