diff --git a/external/subpack/net/openvswitch/patches/0007-build-only-link-libopenvswitch-with-libunwind-libunb.patch b/external/subpack/net/openvswitch/patches/0007-build-only-link-libopenvswitch-with-libunwind-libunb.patch
new file mode 100644
index 0000000..3da8dc1
--- /dev/null
+++ b/external/subpack/net/openvswitch/patches/0007-build-only-link-libopenvswitch-with-libunwind-libunb.patch
@@ -0,0 +1,54 @@
+From e81ccb671014db62bf622cd8f960d7930d27d9dc Mon Sep 17 00:00:00 2001
+From: Yousong Zhou <yszhou4tech@gmail.com>
+Date: Wed, 29 Jul 2020 17:29:14 +0800
+Subject: [PATCH] build: only link libopenvswitch with libunwind, libunbound
+
+Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>
+---
+ lib/automake.mk          | 2 ++
+ lib/libopenvswitch.pc.in | 2 +-
+ m4/openvswitch.m4        | 6 ++++--
+ 3 files changed, 7 insertions(+), 3 deletions(-)
+
+--- a/lib/automake.mk
++++ b/lib/automake.mk
+@@ -10,6 +10,8 @@ lib_LTLIBRARIES += lib/libopenvswitch.la
+ lib_libopenvswitch_la_LIBADD = $(SSL_LIBS)
+ lib_libopenvswitch_la_LIBADD += $(CAPNG_LDADD)
+ lib_libopenvswitch_la_LIBADD += $(LIBBPF_LDADD)
++lib_libopenvswitch_la_LIBADD += $(LIBUNBOUND_LDADD)
++lib_libopenvswitch_la_LIBADD += $(LIBUNWIND_LDADD)
+ 
+ 
+ if WIN32
+--- a/lib/libopenvswitch.pc.in
++++ b/lib/libopenvswitch.pc.in
+@@ -7,5 +7,5 @@ Name: libopenvswitch
+ Description: Open vSwitch library
+ Version: @VERSION@
+ Libs: -L${libdir} -lopenvswitch
+-Libs.private: @LIBS@ @SSL_LIBS@ @CAPNG_LDADD@ @LIBBPF_LDADD@
++Libs.private: @LIBS@ @SSL_LIBS@ @CAPNG_LDADD@ @LIBBPF_LDADD@ @LIBUNBOUND_LDADD@ @LIBUNWIND_LDADD@
+ Cflags: -I${includedir}
+--- a/m4/openvswitch.m4
++++ b/m4/openvswitch.m4
+@@ -677,7 +677,8 @@ AC_DEFUN([OVS_CHECK_UNBOUND],
+   [AC_CHECK_LIB(unbound, ub_ctx_create, [HAVE_UNBOUND=yes], [HAVE_UNBOUND=no])
+    if test "$HAVE_UNBOUND" = yes; then
+      AC_DEFINE([HAVE_UNBOUND], [1], [Define to 1 if unbound is detected.])
+-     LIBS="$LIBS -lunbound"
++     LIBUNBOUND_LDADD="-lunbound"
++     AC_SUBST(LIBUNBOUND_LDADD)
+    fi
+    AM_CONDITIONAL([HAVE_UNBOUND], [test "$HAVE_UNBOUND" = yes])
+    AC_SUBST([HAVE_UNBOUND])])
+@@ -689,7 +690,8 @@ AC_DEFUN([OVS_CHECK_UNWIND],
+    [HAVE_UNWIND=no])
+    if test "$HAVE_UNWIND" = yes; then
+      AC_DEFINE([HAVE_UNWIND], [1], [Define to 1 if unwind is detected.])
+-     LIBS="$LIBS -lunwind"
++     LIBUNWIND_LDADD="-lunwind"
++     AC_SUBST(LIBUNWIND_LDADD)
+    fi
+    AM_CONDITIONAL([HAVE_UNWIND], [test "$HAVE_UNWIND" = yes])
+    AC_SUBST([HAVE_UNWIND])])