util: xdp_sample.skel.h cannot be gen, Error: extra unknown arguments

[its.bread]

Debian 11 - 5.10.0-21-amd64

./configure
Found clang binary 'clang' with version 11 (from 'Debian clang version 11.0.1-2')
using bpftool v5.10.162
libbpf support: submodule v1.0.0
  perf_buffer__consume support: yes (submodule)
  btf__load_from_kernel_by_id support: yes (submodule)
  btf__type_cnt support: yes (submodule)
  bpf_object__next_map support: yes (submodule)
  bpf_object__next_program support: yes (submodule)
  bpf_program__insn_cnt support: yes (submodule)
  bpf_map_create support: yes (submodule)
  perf_buffer__new_raw support: yes (submodule)
  bpf_xdp_attach support: yes (submodule)
  bpf_map__set_autocreate support: yes (submodule)
  bpf_prog_test_run_opts support: yes (submodule)
zlib support: yes
ELF support: yes
pcap support: yes
secure_getenv support: yes

-

make

lib

  libbpf
    CC       libbpf/src/libbpf.a
    INSTALL  libbpf/src/libbpf.a

  libxdp
    CC       staticobjs/libxdp.o
    CC       staticobjs/xsk.o
    M4       xdp-dispatcher.c
    CLANG    xdp-dispatcher.o
    LLC      xdp-dispatcher.o
    GEN      xdp-dispatcher.embed.o
    CLANG    xsk_def_xdp_prog.o
    LLC      xsk_def_xdp_prog.o
    GEN      xsk_def_xdp_prog.embed.o
    CLANG    xsk_def_xdp_prog_5.3.o
    LLC      xsk_def_xdp_prog_5.3.o
    GEN      xsk_def_xdp_prog_5.3.embed.o
    LINK     libxdp.a
    CC       sharedobjs/libxdp.o
    CC       sharedobjs/xsk.o
    LINK     libxdp.so.1.3.0

  util
    CLANG    xdp_sample.bpf.o
    LLC      xdp_sample.bpf.o
    GEN      xdp_sample.skel.h
Error: extra unknown arguments
make[2]: *** [Makefile:34: xdp_sample.skel.h] Error 255
make[1]: *** [Makefile:13: util] Error 2
make: *** [Makefile:25: lib] Error 2

[Toke Høiland-Jørgensen]

Looks like your bpftool version is too old. We should fix the version detection in the configure script, though...