config: restore the libtool minimum version to 1.5

Very few systems still use this old version, but it would be
inconvenient to build a video driver with libtool 1.5 and have
to build the gpu tools on another system having libtool 2.2.

The toolchain version requirements are documented here:
http://www.x.org/wiki/ModularDevelopersGuide#GNU_Build_System

Signed-off-by: Gaetan Nadon <memsize@videotron.ca>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/configure.ac b/configure.ac
index 2715fbf..b415a97 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -35,8 +35,8 @@ AM_INIT_AUTOMAKE([foreign dist-bzip2])
 AM_MAINTAINER_MODE
 
 # Initialize libtool
-LT_PREREQ([2.2])
-LT_INIT([disable-static])
+AC_DISABLE_STATIC
+AC_PROG_LIBTOOL
 
 # Require X.Org macros 1.8 or later for MAN_SUBSTS set by XORG_MANPAGE_SECTIONS
 m4_ifndef([XORG_MACROS_VERSION],