Replace LEX macro with preferred one

diff --git a/configure.ac b/configure.ac
index f0d08ea..0308b48 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -41,7 +41,7 @@ LIBREADLINE=
 )])
 
 dnl Testing for Lex/Yacc
-AC_PROG_LEX
+AM_PROG_LEX
 AC_PROG_YACC
 
 dnl Checking for typedefs, structures, and compiler characteristics.