#define XENV_CAP_MOUSE (1<<1)
/* xenv_flags specify if we need keys and mouse,
- * flag is removed if input is not available */
+ * on return, flag is removed if input is not available */
int xenv_init(int *xenv_flags, const char *window_title);
/* read events from X, calling key_cb for key, mouseb_cb for mouse button