diff --git a/share/mk/bsd.kmod.mk b/share/mk/bsd.kmod.mk
new file mode 100644
index 000000000000..b4c4236479b3
--- /dev/null
+++ b/share/mk/bsd.kmod.mk
@@ -0,0 +1,13 @@
+# $FreeBSD$
+
+# Search for kernel source tree in standard places.
+.for _dir in ${.CURDIR}/../.. ${.CURDIR}/../../.. /sys /usr/src/sys
+.if !defined(SYSDIR) && exists(${_dir}/kern/) && exists(${_dir}/conf/)
+SYSDIR=	${_dir}
+.endif
+.endfor
+.if !defined(SYSDIR) || !exists(${SYSDIR}/kern/) || !exists(${SYSDIR}/conf/)
+.error "can't find kernel source tree"
+.endif
+
+.include "${SYSDIR}/kmod.mk"