added AC_PREREQ(2.50) to prevent autoconf mistakes

diff --git a/configure.in b/configure.in
index dd80c394ee16d5a3df6b68799d86351a80382677..abc91383a1ae68edac44e01d32dc778920b9ff92 100644 (file)
--- a/configure.in
+++ b/configure.in
@@ -1,9 +1,16 @@
 dnl $Id$
 dnl Process this file with autoconf to produce a configure script.
+
+dnl Ensure that this file is processed with autoconf 2.50 or newer
+dnl Don't even think about removing this check!
+AC_PREREQ(2.50)
+
+dnl First some basic init macros
 AC_INIT
 AC_CONFIG_SRCDIR([lib/urldata.h])
 AM_CONFIG_HEADER(config.h src/config.h)
 
+dnl figure out the libcurl version
 VERSION=`sed -ne 's/^#define LIBCURL_VERSION "\(.*\)"/\1/p' ${srcdir}/include/curl/curl.h`
 AM_INIT_AUTOMAKE(curl,$VERSION)