making all mod_av

make[4]: Entering directory `/usr/local/src/freeswitch/src/mod/applications/mod_av'

Makefile:833: *** You must install libvpx2-dev to build mod_av.  Stop.

make[4]: Leaving directory `/usr/local/src/freeswitch/src/mod/applications/mod_av'

make[3]: *** [mod_av-all] Error 1

make[3]: Leaving directory `/usr/local/src/freeswitch/src/mod'

make[2]: *** [all-recursive] Error 1

make[2]: Leaving directory `/usr/local/src/freeswitch/src'

make[1]: *** [all-recursive] Error 1

make[1]: Leaving directory `/usr/local/src/freeswitch'

make: *** [all] Error 2