APIC mode uses IO APICs

- kernel turns on IO APICs if no_apic is _not_ set or is equal 0

- pci driver must use the acpi driver to setup IRQ routing otherwise
  the system cannot work correctly except systems like KVM that use
  only legacy (E)ISA IRQs 0-15

kernel/Makefile

@@ -23,8 +23,8 @@ DPADD+=	${LIBC}
 LDADD+=	-lc
 .endif
 
-CPPFLAGS+=	-I${.CURDIR}/arch/${ARCH}/include -I${MINIXSRCDIR}
-AFLAGS+=	-I${.CURDIR}/arch/${ARCH}/include -I${MINIXSRCDIR}
+CPPFLAGS+=	-I${.CURDIR} -I${.CURDIR}/arch/${ARCH}/include -I${MINIXSRCDIR}
+AFLAGS+=	-I${.CURDIR} -I${.CURDIR}/arch/${ARCH}/include -I${MINIXSRCDIR}
 
 INSTALLFLAGS+=	-S 0
 BINDIR=	/usr/sbin