$ ./autogen.sh 
xdt-autogen: It is recommended to use IT_PROG_INTLTOOL([0.35.0])
             in your configure.ac file and remove AC_PROG_INTLTOOL

             See http://bugzilla.xfce.org/show_bug.cgi?id=8930 for
             more information.

Preparing package directory /tmp/xfce4-mount-plugin...
Creating /tmp/xfce4-mount-plugin/aclocal.m4...
Running glib-gettextize --force --copy...
Copying file po/Makefile.in.in

Please add the files
  codeset.m4 gettext.m4 glibc21.m4 iconv.m4 isc-posix.m4 lcmessage.m4
  progtest.m4
from the /usr/share/aclocal directory to your autoconf macro directory
or directly to your aclocal.m4 file.
You will also need config.guess and config.sub, which you can get from
ftp://ftp.gnu.org/pub/gnu/config/.

Running intltoolize --automake --copy --force
Patching file 'po/Makefile.in.in'
Running libtoolize --force --copy...
libtoolize: putting auxiliary files in '.'.
libtoolize: copying file './ltmain.sh'
libtoolize: putting macros in AC_CONFIG_MACRO_DIRS, 'm4'.
libtoolize: copying file 'm4/libtool.m4'
libtoolize: copying file 'm4/ltoptions.m4'
libtoolize: copying file 'm4/ltsugar.m4'
libtoolize: copying file 'm4/ltversion.m4'
libtoolize: copying file 'm4/lt~obsolete.m4'
libtoolize: Consider adding '-I m4' to ACLOCAL_AMFLAGS in Makefile.am.
Running aclocal   -I /usr/share/xfce4/dev-tools/m4macros -I /usr/share/xfce4/dev-tools/m4macros -I /tmp/xfce4-mount-plugin/m4...
/tmp/xfce4-mount-plugin/m4/glib-gettext.m4:37: error: m4_copy: won't overwrite defined macro: glib_DEFUN
/tmp/xfce4-mount-plugin/m4/glib-gettext.m4:37: the top level
autom4te: /usr/bin/m4 failed with exit status: 1
aclocal: error: echo failed with exit status: 1

---
 configure.ac.in    | 2 +-
 m4/glib-gettext.m4 | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/configure.ac.in b/configure.ac.in
index 3419e6d..a41b154 100644
--- a/configure.ac.in
+++ b/configure.ac.in
@@ -34,7 +34,7 @@ AC_MINIX
 dnl Check for basic programs
 AC_PROG_CC
 AC_PROG_INSTALL
-AC_PROG_INTLTOOL
+IT_PROG_INTLTOOL([0.35.0])
 
 dnl Initialize libtool
 LT_PREREQ([2.2.6])
diff --git a/m4/glib-gettext.m4 b/m4/glib-gettext.m4
index 5a4ef28..a6db6fa 100644
--- a/m4/glib-gettext.m4
+++ b/m4/glib-gettext.m4
@@ -34,8 +34,8 @@ dnl We go to great lengths to make sure that aclocal won't
 dnl try to pull in the installed version of these macros
 dnl when running aclocal in the glib directory.
 dnl
-m4_copy([AC_DEFUN],[glib_DEFUN])
-m4_copy([AC_REQUIRE],[glib_REQUIRE])
+m4_copy_force([AC_DEFUN],[glib_DEFUN])
+m4_copy_force([AC_REQUIRE],[glib_REQUIRE])
 dnl
 dnl At the end, if we're not within glib, we'll define the public
 dnl definitions in terms of our private definitions.
-- 
2.7.1