Note: this patch has been removed in OpenWrt, we in Freetz however still need it
      as we still (have to) support uClibc versions prior to 0.9.30

--- coreutils/id.c
+++ coreutils/id.c
@@ -62,9 +62,12 @@
 
 /* This is a NOEXEC applet. Be very careful! */
 
+#define HAVE_GETGROUPLIST 1
+
 #if !ENABLE_USE_BB_PWD_GRP
 #if defined(__UCLIBC__) && UCLIBC_VERSION < KERNEL_VERSION(0, 9, 30)
-#error "Sorry, you need at least uClibc version 0.9.30 for id applet to build"
+#undef HAVE_GETGROUPLIST
+#define HAVE_GETGROUPLIST 0
 #endif
 #endif
 
@@ -125,7 +127,11 @@
 		/* If the user is a member of more than
 		 * *n groups, then -1 is returned. Otherwise >= 0.
 		 * (and no defined way of detecting errors?!) */
+#if HAVE_GETGROUPLIST
 		m = getgrouplist(username, rgid, groups, n);
+#else
+		*n = -1;
+#endif
 		/* I guess *n < 0 might indicate error. Anyway,
 		 * malloc'ing -1 bytes won't be good, so: */
 		if (*n < 0)
@@ -207,6 +213,7 @@
 			if (egid != rgid)
 				status |= print_group(egid, " ");
 		}
+#if HAVE_GETGROUPLIST
 		/* We are supplying largish buffer, trying
 		 * to not run get_groups() twice. That might be slow
 		 * ("user database in remote SQL server" case) */
@@ -233,6 +240,7 @@
 		}
 		if (ENABLE_FEATURE_CLEAN_UP)
 			free(groups);
+#endif
 #if ENABLE_SELINUX
 		if (is_selinux_enabled()) {
 			if (getcon(&scontext) == 0)