--- src/include/Makefile	2014-10-16 11:12:03.000000000 +0200
+++ src/include/Makefile	2014-10-16 11:00:07.000000000 +0200
@@ -133,6 +133,18 @@
 
 .include <bsd.prog.mk>
 
+# Install sys/param.h at install target if installincludes is requested to
+# be skipped. This keeps the ports tree usefull on machines which otherwise
+# don't have include files, since bsd.port.mk extracts OSVERSIION from it.
+.if defined(MK_TOOLCHAIN) && ${MK_TOOLCHAIN} == "no"
+install:
+.if exists(${DESTDIR}${INCLUDEDIR}/sys)
+	cd ${.CURDIR}/../sys/sys; \
+	${INSTALL} -C -o ${BINOWN} -g ${BINGRP} -m 444 param.h \
+	    ${DESTDIR}${INCLUDEDIR}/sys
+.endif
+.endif
+
 installincludes: ${SHARED}
 ${SHARED}: compat