--- wdiff.c.orig	Sun Nov  6 02:57:23 1994
+++ wdiff.c	Wed Aug  1 16:48:38 2001
@@ -892,8 +892,9 @@
 {
   /* Launch the diff program.  */
 
+  unsetenv ("DIFF_OPTIONS");
   if (ignore_case)
-    input_file = readpipe (DIFF_PROGRAM, "-c", left_side->temp_name,
+    input_file = readpipe (DIFF_PROGRAM, "-i", left_side->temp_name,
 			   right_side->temp_name, NULL);
   else
     input_file = readpipe (DIFF_PROGRAM, left_side->temp_name,