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There is no need to re-build BPF object files if any of the sources of libbpf change. So record more precise dependency only on libbpf/bpf_*.h headers. This eliminates unnecessary re-builds. Signed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200820231250.1293069-2-andriin@fb.com