Replaced all G_Printf calls with Com_Printf.
Replaced Q_stricmp calls with the more commonly used Q_strcmp.
Replaced G_Error (which is a Quake 3 function) with the regular Com_Printf.
Removed a few calls to non-existing (or out of scope) functions (but with valid prototype).
Changed the playerMins and playerMaxs vectors to be used outside g_client.c.