虚拟机Ubuntu下Freeswitch安装求助

make后出现的问题：

Entering directory '/home/coco/freeswitch/src/mod/applications/mod_signalwire'
Makefile:929: *** You must install libks to build mod_signalwire.  Stop.
make[4]: Leaving directory '/home/coco/freeswitch/src/mod/applications/mod_signalwire'
Makefile:683: recipe for target 'mod_signalwire-all' failed
make[3]: *** [mod_signalwire-all] Error 1
make[3]: Leaving directory '/home/coco/freeswitch/src/mod'
Makefile:591: recipe for target 'all-recursive' failed
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory '/home/coco/freeswitch/src'
Makefile:3494: recipe for target 'all-recursive' failed
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory '/home/coco/freeswitch'
Makefile:1255: recipe for target 'all' failed
make: *** [all] Error 2

主要是“You must install libks to build mod_signalwire.”提示的“libks”怎么搞啊，小白真的搞了好久，依赖包找不到，安装了包含它的所有依赖后还是报错，难道是别的问题？

求助大神们！！！！！