CC       synaptics.lo
  CC       synproto.lo
In file included from /usr/include/string.h:634:0,
                 from /usr/include/xorg/os.h:53,
                 from /usr/include/xorg/misc.h:115,
                 from /usr/include/xorg/xf86str.h:37,
                 from /usr/include/xorg/xf86Xinput.h:54,
                 from synproto.h:36,
                 from synproto.c:24:
/usr/include/xorg/os.h:579:1: error: expected identifier or '(' before '__extension__'
 strndup(const char *str, size_t n);
 ^
Makefile:504: recipe for target 'synproto.lo' failed
make[2]: *** [synproto.lo] Error 1
make[2]: Leaving directory '/home/diego/xps13/PKGs/xf86-input-synaptics-xswipe-git/src/xf86-input-synaptics-xswipe-git/src'
Makefile:499: recipe for target 'all-recursive' failed
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory '/home/diego/xps13/PKGs/xf86-input-synaptics-xswipe-git/src/xf86u p-input-synaptics-xswipe-git'
Makefile:407: recipe for target 'all' failed
make: *** [all] Error 2