Patch from Lars Kellogg-Stedman:
Glibc 2.1.3 (used by the Hardhat Linux SDK distributed by Cyclades)
does not define IF_NAMESIZE in net/if.h.
diff --git a/networking/nameif.c b/networking/nameif.c
index e74a042..dca7c8c 100644
--- a/networking/nameif.c
+++ b/networking/nameif.c
@@ -35,6 +35,15 @@
#include "busybox.h"
+/* Older versions of net/if.h do not appear to define IF_NAMESIZE. */
+#ifndef IF_NAMESIZE
+# ifdef IFNAMSIZ
+# define IF_NAMESIZE IFNAMSIZ
+# else
+# define IF_NAMESIZE 16
+# endif
+#endif
+
/* take from linux/sockios.h */
#define SIOCSIFNAME 0x8923 /* set interface name */