iproute2 fails to build setting LIBBPF_DYNAMIC unless LIBBPF_DIR is defined.

[neil at digit-labs.org]

Recent iproute2 version bump fails to build setting LIBBPF_DYNAMIC unless LIBBPF_DIR is defined.
Another issue in bpf_libbpf.c relating to non inclusion of limits.h (undefined PATH_MAX).

Index: iproute2-5.11.0/lib/bpf_libbpf.c
===================================================================
--- iproute2-5.11.0.orig/lib/bpf_libbpf.c
+++ iproute2-5.11.0/lib/bpf_libbpf.c
@@ -13,6 +13,7 @@
 #include <stdint.h>
 #include <errno.h>
 #include <fcntl.h>
+#include <limits.h>

 #include <libelf.h>
 #include <gelf.h>

Signed-off-by: Neil Kettle neil at digit-labs.org

diff --git a/package/network/utils/iproute2/Makefile b/package/network/utils/iproute2/Makefile
index 440e33069b..8079f6fcb2 100644
--- a/package/network/utils/iproute2/Makefile
+++ b/package/network/utils/iproute2/Makefile
@@ -132,6 +132,7 @@ MAKE_FLAGS += \
 	KERNEL_INCLUDE="$(LINUX_DIR)/user_headers/include" \
 	SHARED_LIBS=$(SHARED_LIBS) \
 	IP_CONFIG_TINY=$(IP_CONFIG_TINY) \
+	LIBBPF_DIR=$(STAGING_DIR) \
 	LIBBPF_FORCE=$(LIBBPF_FORCE) \
 	HAVE_ELF=$(HAVE_ELF) \
 	HAVE_MNL=$(HAVE_MNL) \