- Fixed a bug that crashed wmaker when selecting the "Start alternate window

manager" option in the crashing dialog panel.
- Window Maker will now use the WINDOWMAKER_ALT_WM environment variable (if
  it is defined) to overwrite the default hardcoded fallback window manager.

src/WindowMaker.h

@@ -321,7 +321,8 @@ typedef struct WPreferences {
 				       /* paths to find pixmaps */
     char *icon_path;		       /* : separated list of */
 				       /* paths to find icons */
-    
+    WMArray *fallbackWMs;              /* fallback window manager list */
+
     char *logger_shell;		       /* shell to log child stdi/o */
 
     RImage *button_images;	       /* titlebar button images */