Avoid warning:
../../../../ext/fox16_c/frames_wrap.cpp: In function ‘VALUE FXGradientBar_gradient(FX::FXGradientBar*, FX::FXint)’:
../../../../ext/fox16_c/frames_wrap.cpp:2465:37: warning: zero-length gnu_printf format string [-Wformat-zero-length]
           rb_raise(rb_eNoMemError,"");
                                     ^
Avoid warning:
../../../../ext/fox16_c/FXRbApp.cpp: In static member function ‘static FXRbApp* FXRbApp::constructAndInit(const FXchar*, const FXchar*)’:
../../../../ext/fox16_c/FXRbApp.cpp:58:28: warning: deprecated conversion from string constant to ‘char*’ [-Wwrite-strings]
   static char* argv[]={"",0};
                            ^
Load icon independent from pwd.