From ffe4d100e13fdecd16c4c4731cea2a9407b9d96a Mon Sep 17 00:00:00 2001
From: Raphael Campos <raphaelcampos.rp@gmail.com>
Date: Fri, 12 Jul 2024 15:23:22 -0500
Subject: [PATCH] fix(build): include libbpf during libbpfgo compilation

An issue appears when we try to compile libbpfgo on an older kernel that
doesn't have the XDP_FLAGS_REPLACE defined in
/usr/include/linux/if_link.h. To overcome this, it is necessary to
include the directory of libbpf under 3rdparty during the compilation,
since install_uapi_headers doesn't install if_link.h.
---
 Makefile | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index b1bae250..78872cc0 100644
--- a/Makefile
+++ b/Makefile
@@ -24,6 +24,7 @@ ARCH ?= $(shell uname -m | sed 's/x86_64/amd64/g; s/aarch64/arm64/g')
 # libbpf
 
 LIBBPF_SRC = $(abspath ./libbpf/src)
+LIBBPF_INCLUDE = $(abspath ./libbpf/include/uapi)
 LIBBPF_OBJ = $(abspath ./$(OUTPUT)/libbpf.a)
 LIBBPF_OBJDIR = $(abspath ./$(OUTPUT)/libbpf)
 LIBBPF_DESTDIR = $(abspath ./$(OUTPUT))
@@ -33,7 +34,7 @@ LDFLAGS =
 
 # golang
 
-CGO_CFLAGS_STATIC = "-I$(abspath $(OUTPUT))"
+CGO_CFLAGS_STATIC = "-I$(abspath $(OUTPUT)) -I$(LIBBPF_INCLUDE)"
 CGO_LDFLAGS_STATIC = "$(shell PKG_CONFIG_PATH=$(LIBBPF_OBJDIR) $(PKGCONFIG) --static --libs libbpf)"
 CGO_EXTLDFLAGS_STATIC = '-w -extldflags "-static"'