--- bc-1.06/configure.flex	2000-10-03 20:34:24.000000000 +0200
+++ bc-1.06/configure	2007-01-10 16:09:35.000000000 +0100
@@ -2245,7 +2245,7 @@ fi
 
 
 if test "$LEX" = "flex" ; then
- LEX="flex -I8"
+ LEX="flex -I -8"
 else
  if test "$bcrl" = "y" ; then
   echo "configure: warning: readline works only with flex." 1>&2
--- bc-1.06/configure.in.flex	2000-07-08 01:34:09.000000000 +0200
+++ bc-1.06/configure.in	2007-01-10 16:09:15.000000000 +0100
@@ -68,7 +68,7 @@ AC_ARG_WITH(readline,[  --with-readline 
 ])
 
 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.)