Error while building on mac

General
1

I am facing errors while building the system using waf on mac. The error says :

…/…/libraries/SITL/SIM_Submarine.cpp:38:12: fatal error: constructor for ‘SITL::Submarine’ must explicitly initialize the const member 'frame_proprietary’
Submarine::Submarine(const char *home_str, const char *frame_str) :
^
…/…/libraries/SITL/SIM_Submarine.h:56:7: note: ‘frame_proprietary’ declared here
} frame_proprietary;
^
1 error generated.

Please help me fix it.