请教一个C＋＋的问题

mgjrr

[root@localhost dev]# g++ test.cpp -I/usr/include/X11 -I/usr/include/X11/Xft -I/usr/include/X11/extensions -I/usr/include/freetype2 -L/usr/X11R6/lib -lsl -lpthread -lX11 -lXft

/usr/include/SL/./common/SClasses.h:177: 错误：expected ‘;’ before ‘*’ token
/usr/include/SL/./common/SClasses.h:296: 错误：expected ‘;’ before ‘*’ token

SClasses.h中

176        friend class SMouseHook;
177        static SMouseHook *MouseHook;

请问可能会是什么原因

x11

我猜 friend class SMouseHook只是说明了class SMouseHook和本类的关系，并没有定义一个类SMouseHook