Update the autoconf stuff
diff --git a/configure.in b/configure.in
index b3691d5..3176b1d 100644
--- a/configure.in
+++ b/configure.in
@@ -3,20 +3,24 @@
dnl
dnl Process this file with autoconf to produce a configure script.
dnl
+
+AC_PREREQ(2.50)
AC_INIT()
-AM_MAINTAINER_MODE
-
AM_INIT_AUTOMAKE(bluez-libs, 2.6)
+AM_MAINTAINER_MODE
+
AC_PREFIX_DEFAULT(/usr)
CFLAGS="-Wall -g -O2"
+AC_LANG_C
+
AC_PROG_CC
AC_PROG_INSTALL
-dnl AC_LIBTOOL_TAGS([])
+m4_ifdef([AC_LIBTOOL_TAGS], [AC_LIBTOOL_TAGS([])])
AC_PROG_LIBTOOL