===> usr.sbin/pc-sysinstall/pc-sysinstall (depend)
===> usr.sbin/pciconf (depend)
rm -f .depend
CC='clang' mkdep -f .depend -a     -std=gnu99   pciconf.c cap.c err.c
pciconf.c:49:10: fatal error: 'pcireg.h' file not found
#include "pcireg.h"
         ^
1 error generated.
mkdep: compile failed
*** [.depend] Error code 1
1 error
*** [depend] Error code 2
1 error
*** [depend] Error code 2
1 error
*** [depend] Error code 2
1 error