Hi Daniel, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: f1fcbaa18b28dec10281551dfe6ed3a3ed80e3d6 commit: 110acbc6a4518145db3a1a9c0686d730bb258bf1 tools/thermal: Add a temperature capture tool date: 12 months ago compiler: gcc-11 (Debian 11.3.0-12) 11.3.0 reproduce: # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=110acbc6a4518145db3a1a9c0686d730bb258bf1 git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 110acbc6a4518145db3a1a9c0686d730bb258bf1 make O=/tmp/kselftest headers make O=/tmp/kselftest -C tools/testing/selftests If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot | Link: https://lore.kernel.org/oe-kbuild-all/202305160546.2nHa8qoJ-lkp@intel.com/ All errors (new ones prefixed by >>): >> thermometer.c:21:10: fatal error: libconfig.h: No such file or directory 21 | #include | ^~~~~~~~~~~~~ compilation terminated. make[2]: *** [Makefile:23: thermometer] Error 1 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests