diff -urNad --exclude=CVS --exclude=.svn ./src/xdefaults.c /tmp/dpep-work.T9H3hg/aterm-1.0.0/src/xdefaults.c
--- src/xdefaults.c	2005-07-31 18:31:49.000000000 +0200
+++ src/xdefaults.c	2005-07-31 18:46:26.000000000 +0200
@@ -862,8 +862,12 @@
 				s = !s;
 			    if (s)
 				Options |= (optList[entry].flag);
-			    else
+			    else {
+				if (my_strcasecmp(str, "FALSE"))
+				    print_error("Cannot parse value \"%s\" from resource \"%s\" as boolean",
+						str, kw);
 				Options &= ~(optList[entry].flag);
+			    }
 			}
 		    }
 		    break;
@@ -945,8 +949,12 @@
 		    s = !s;
 		if (s)
 		    Options |= (optList[entry].flag);
-		else
+		else {
+		    if (my_strcasecmp(p, "FALSE"))
+			print_error("Cannot parse value \"%s\" from resource \"%s\" as boolean",
+				    p, kw);
 		    Options &= ~(optList[entry].flag);
+		}
 	    }
 	}
     }