Index: sys/conf/kern.post.mk
===================================================================
--- sys/conf/kern.post.mk	(revision 202941)
+++ sys/conf/kern.post.mk	(working copy)
@@ -220,7 +220,12 @@ kernel-install:
 	${INSTALL} -p -m 555 -o ${KMODOWN} -g ${KMODGRP} ${KERNEL_KO} ${DESTDIR}${KODIR}
 .if defined(DEBUG) && !defined(INSTALL_NODEBUG)
 	${INSTALL} -p -m 555 -o ${KMODOWN} -g ${KMODGRP} ${KERNEL_KO}.symbols ${DESTDIR}${KODIR}
+.if exists(bzip2)
+	bzip2 -9 ${DESTDIR}${KODIR}/${KERNEL_KO}.symbols
+.elif exists(gzip)
+	gzip -9 ${DESTDIR}${KODIR}/${KERNEL_KO}.symbols
 .endif
+.endif
 .if defined(KERNEL_EXTRA_INSTALL)
 	${INSTALL} -p -m 555 -o ${KMODOWN} -g ${KMODGRP} ${KERNEL_EXTRA_INSTALL} ${DESTDIR}${KODIR}
 .endif
@@ -232,7 +237,12 @@ kernel-reinstall:
 	${INSTALL} -p -m 555 -o ${KMODOWN} -g ${KMODGRP} ${KERNEL_KO} ${DESTDIR}${KODIR}
 .if defined(DEBUG) && !defined(INSTALL_NODEBUG)
 	${INSTALL} -p -m 555 -o ${KMODOWN} -g ${KMODGRP} ${KERNEL_KO}.symbols ${DESTDIR}${KODIR}
+.if exists(bzip2)
+	bzip2 -9 ${DESTDIR}${KODIR}/${KERNEL_KO}.symbols
+.elif exists(gzip)
+	gzip -9 ${DESTDIR}${KODIR}/${KERNEL_KO}.symbols
 .endif
+.endif
 
 config.o env.o hints.o vers.o vnode_if.o:
 	${NORMAL_C}
Index: sys/conf/kmod.mk
===================================================================
--- sys/conf/kmod.mk	(revision 202941)
+++ sys/conf/kmod.mk	(working copy)
@@ -272,7 +272,12 @@ _kmodinstall:
 .if defined(DEBUG_FLAGS) && !defined(INSTALL_NODEBUG)
 	${INSTALL} -o ${KMODOWN} -g ${KMODGRP} -m ${KMODMODE} \
 	    ${_INSTALLFLAGS} ${PROG}.symbols ${DESTDIR}${KMODDIR}
+.if exists(bzip2)
+	bzip2 -9 ${DESTDIR}${KMODDIR}/${PROG}.symbols
+.elif exists(gzip)
+	gzip -9 ${DESTDIR}${KMODDIR}/${PROG}.symbols
 .endif
+.endif
 
 .include <bsd.links.mk>