Builds ok all the way back to these older distros:

   1  almalinux:8    : Ok  gcc (GCC) 8.5.0 20210514 (Red Hat 8.5.0-20) , clang version 16.0.6 (Red Hat 16.0.6-2.module_el8.9.0+3621+df7f7146) flex 2.6.1
   3  alpine:3.15    : Ok  gcc (Alpine 10.3.1_git20211027) 10.3.1 20211027 , Alpine clang version 12.0.1 flex 2.6.4
  15  debian:10      : Ok  gcc (Debian 8.3.0-6) 8.3.0 , Debian clang version 11.0.1-2~deb10u1 flex 2.6.4
  32  opensuse:15.4  : Ok  gcc (SUSE Linux) 7.5.0 , clang version 15.0.7 flex 2.6.4
  23  fedora:35      : Ok  gcc (GCC) 11.3.1 20220421 (Red Hat 11.3.1-3) , clang version 13.0.1 (Fedora 13.0.1-1.fc35) flex 2.6.4
  38  ubuntu:18.04   : Ok  gcc (Ubuntu 7.5.0-3ubuntu1~18.04) 7.5.0  flex 2.6.4

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/lkml/20240315204835.748716-4-acme@kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>