compile 13-tcpconnlat error

[zplinuxlover]

OS: entOS Linux release 7.6.1810 (Core)
GCC: gcc version 4.8.5 20150623 (Red Hat 4.8.5-44) (GCC)

when I compile 13-tcpconnlat, I got the following error

BPFTOOL bpftool/bootstrap/bpftool
... libbfd: [ OFF ]
... clang-bpf-co-re: [ OFF ]
... llvm: [ OFF ]
... libcap: [ OFF ]
make[1]: *** No rule to make target /data/bpf-developer-tutorial/src/third_party/bpftool/libbpf/src/hashmap .h', needed by /data/bpf-developer-tutorial/src/13-tcpconnlat/.output/bpftool/bootstrap/libbpf/include/bpf/
hashmap.h'. Stop.
make: *** [/data/bpf-developer-tutorial/src/13-tcpconnlat/.output/bpftool/bootstrap/bpftool] Error 2

how to resolve the problem?

[YkieWang]

I met the same issue, so do you have found any solution?

[huloves]

Check the bpftool/libbpf path. This may be an empty directory. You can copy a libbpf project to overwrite this empty directory.

[Officeyutong]

Update the submodule