--- bc-1.06/configure.in.flex	2007-02-23 12:12:30.000000000 +0100
+++ bc-1.06/configure.in	2007-02-23 12:12:48.000000000 +0100
@@ -68,7 +68,7 @@
 ])
 
 if test "$LEX" = "flex" ; then
- LEX="flex -I8"
+ LEX="flex -I -8"
 else
  if test "$bcrl" = "y" ; then
   AC_MSG_WARN(readline works only with flex.)