mod_unimrcp canot use in centos7.9

[linggood]

I use these command,

$ git clone https://github.com/freeswitch/mod_unimrcp.git
$ cd mod_unimrcp
$ export PKG_CONFIG_PATH=/usr/local/freeswitch/lib/pkgconfig:/usr/local/unimrcp/lib/pkgconfig
$ ./bootstrap.sh
$ ./configure
$ make
$ sudo make install
$ cd ..

It show that:

checking for FREESWITCH... no
configure: error: Package requirements (freeswitch) were not met:

No package 'freeswitch' found

Consider adjusting the PKG_CONFIG_PATH environment variable if you
installed software in a non-standard prefix.

how could i use it

[seven1240]

you should install FreeSWITCH first

[linggood]

FreeSWITCH has been installed by “yum install ***”，just without mod_unimrcp， so I just want install mod_unimrcp。not install freeswitch by source code install