xserver tries to write in xkeyboard-config:

make[2]: Nothing to be done for 'install-exec-am'.
 /bin//mkdir -p '/tmp/slaps/shared/xkeyboard-config/02d353dc7c1ab898ea120142e33b42f6/share/X11/xkb/compiled'
/bin//mkdir: cannot create directory ‘/tmp/slaps/shared/xkeyboard-config/02d353dc7c1ab898ea120142e33b42f6/share/X11/xkb/compiled’: Permission denied
Makefile:730: recipe for target 'install-dist_xkbcompiledDATA' failed
make[2]: *** [install-dist_xkbcompiledDATA] Error 1