Index: head/devel/p4/Makefile.inc
===================================================================
--- head/devel/p4/Makefile.inc	(revision 374533)
+++ head/devel/p4/Makefile.inc	(revision 374534)
@@ -1,22 +1,28 @@
 # Figure out what to install
+.if ${OPSYS} == FreeBSD
+
 .if ${ARCH} == amd64
 . if ${OSVERSION} >= 1000100
 PLATFORM=	freebsd100x86_64
 . elif ${OSVERSION} >= 700043
 PLATFORM=	freebsd70x86_64
 . else
 IGNORE=		unsupported OS release, sorry
 . endif
 
 .elif ${ARCH} == i386
 . if ${OSVERSION} >= 1000100
 PLATFORM=	freebsd100x86
 . elif ${OSVERSION} >= 700043
 PLATFORM=	freebsd70x86
 . else
 IGNORE=		unsupported OS release, sorry
 . endif
 
 .else
 IGNORE=		unsupported OS release, sorry
+.endif
+
+.else
+IGNORE=		${OPSYS} is unsupported, sorry
 .endif