Add libtool flags in client configure.ac

sflphone-gtk/Makefile.am

 SUBDIRS = src pixmaps
 
+ACLOCAL_AMFLAGS = -I m4
+
 EXTRA_DIST   = sflphone.desktop.in 
 appsdir = $(datadir)/applications
 apps_in_files = sflphone.desktop.in

sflphone-gtk/configure.ac

 AC_INIT([SFLphone],[0.9.3],[sflphoneteam@savoirfairelinux.com],[sflphone])
 AM_CONFIG_HEADER(config.h)
 
+LT_INIT
+
 PACKAGE=SFLphone
 VERSION=0.9.3
 
 AM_INIT_AUTOMAKE($PACKAGE,$VERSION)
+AC_CONFIG_MACRO_DIR([m4])
 
 AC_ARG_WITH(debug,
 		AS_HELP_STRING(