Index: configure.ac
===================================================================
--- configure.ac	(revision c130165b1cd9d1223c07067d0f1ac0db2a3ee28a)
+++ configure.ac	(revision f28b1f8e2045cf20df892aec284fde729f2f3928)
@@ -226,5 +226,5 @@
 AC_PROG_YACC
 if test "${YACC}" = "yacc" ; then echo "Error: bison required." ; exit 1 ; fi
-AC_PROG_LEX
+AC_PROG_LEX(yywrap)
 if test "${LEX}" = "lex" ; then echo "Error: flex required." ; exit 1 ; fi
 LT_INIT