Hi Pablo, Just to clear up a misconception: On Tue, Aug 10, 2021 at 06:09:06PM +0200, Pablo Neira Ayuso wrote: > To ensure that a project compiles standalone (without the need for the > system kernel header files), you can cache a copy of the header in > your software tree (we use this trick for a while in userspace > netfilter software). The concept of a standalone build without kernel headers might have been valid once, but is invalid nowadays. I tried uninstalling the `kernel-headers` package and building. I got the following 2 errors from multiple source files: | In file included from /usr/include/errno.h:28, | from libnetfilter_queue.c:29: | /usr/include/bits/errno.h:26:11: fatal error: linux/errno.h: No such file or directory | 26 | # include <linux/errno.h> | | ^~~~~~~~~~~~~~~ | In file included from /usr/include/sys/socket.h:33, | from /usr/include/netinet/in.h:23, | from /usr/include/arpa/inet.h:22, | from nlmsg.c:9: | /usr/include/bits/socket.h:354:11: fatal error: asm/socket.h: No such file or directory | 354 | # include <asm/socket.h> | | ^~~~~~~~~~~~~~ To see if an older version of glibc didn't use kernel headers, I tried a build from my Slackware 14.2 VM (2016-06-30). It failed in ./configure: | checking how to run the C preprocessor... /lib/cpp | configure: error: in `/dimstar/usr/src/libnetfilter_queue': | configure: error: C preprocessor "/lib/cpp" fails sanity check | See `config.log' for more details config.log shows: | | /* end confdefs.h. */ | | #ifdef __STDC__ | | # include <limits.h> | | #else | | # include <assert.h> | | #endif | | Syntax error | configure:8489: /lib/cpp conftest.c | In file included from /usr/include/bits/posix1_lim.h:160:0, | from /usr/include/limits.h:143, | from /usr/lib64/gcc/x86_64-slackware-linux/5.3.0/include-fixed/limits.h:168, | from /usr/lib64/gcc/x86_64-slackware-linux/5.3.0/include-fixed/syslimits.h:7, | from /usr/lib64/gcc/x86_64-slackware-linux/5.3.0/include-fixed/limits.h:34, | from conftest.c:12: | /usr/include/bits/local_lim.h:38:26: fatal error: linux/limits.h: No such file or directory Cheers ... Duncan.
