configure: error: libopenvswitch.a was not found. Try --with-ovs-libpath

[MaXiao93]

When i install the of-config, i run the comman:
./configure --with-ovs-srcdir=/root/openvswitch-2.3.1 PKG_CONFIG_PATH=/usr/local/lib/pkgconfig/
Then i had get the error result:
configure: error: libopenvswitch.a was not found. Try --with-ovs-libpath
But i use this command to find the libopenvswitch.a file:
sudo find / -iname libopenvswitch.a -type f
And i had serch the file:
/lib/libopenvswitch.a
/usr/local/lib/libopenvswitch.a
/home/mx/ovs/lib/.libs/libopenvswitch.a
Please help me to solve this problem , thanks!

[blp]

Did you build OVS? The build should create the library .a file.