cdogs-sdl doesn't build with GCC 16 with -Werror:

[ 66s] /home/abuild/rpmbuild/BUILD/cdogs-sdl-2.4.0-build/cdogs-sdl-2.4.0/src/prep.c: In function ‘GameOptionsUpdate’:
[ 66s] /home/abuild/rpmbuild/BUILD/cdogs-sdl-2.4.0-build/cdogs-sdl-2.4.0/src/prep.c:726:33: error: variable ‘j’ set but not used [-Werror=unused-but-set-variable=]
[ 66s] 726 | for (int i = 0, j = 0; i < (int)gData->allowed.size; i++, j++)
[ 66s] | ^
[ 66s] cc1: all warnings being treated as errors

Full build log: https://build.opensuse.org/build/home:rguenther:plgrnd/openSUSE_Factory/x86_64/cdogs-sdl/_log

In GCC 16, pre/post increments no longer count as variable uses. If the variable is not used in any other way, it issues a warning, as seen above. If you don't want to deal with GCC 16 yourself, I can test fixes for you.