Update configure.ac.in

* Bump required version to 2.69
* Replace some obsolete macros

configure.ac.in

@@ -19,32 +19,32 @@ dnl *** Initialize autoconf ***
 dnl ***************************
 AC_COPYRIGHT([Copyright (C) 2015
         Alessio Piccoli, Cedric Leporcq. All rights reserved.])
-AC_INIT([xfce4-windowck-plugin], [windowck_version], [https://gitlab.xfce.org/panel-plugins/xfce4-windowck-plugin/-/issues], [xfce4-windowck-plugin], [https://goodies.xfce.org/projects/panel-plugins/xfce4-windowck-plugin])
-AC_PREREQ([2.50])
+AC_INIT([xfce4-windowck-plugin],[windowck_version],[https://gitlab.xfce.org/panel-plugins/xfce4-windowck-plugin/-/issues],[xfce4-windowck-plugin],[https://goodies.xfce.org/projects/panel-plugins/xfce4-windowck-plugin])
+AC_PREREQ([2.69])
 AC_REVISION([xfce4_panel_version_build])
 
 dnl ***************************
 dnl *** Initialize automake ***
 dnl ***************************
 AM_INIT_AUTOMAKE([1.8 no-dist-gzip dist-bzip2 tar-ustar])
-AM_CONFIG_HEADER([config.h])
+AC_CONFIG_HEADERS([config.h])
 AM_MAINTAINER_MODE()
 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
 
 dnl *******************************
 dnl *** Check for UNIX variants ***
 dnl *******************************
-AC_AIX()
-AC_ISC_POSIX()
+AC_USE_SYSTEM_EXTENSIONS
+AC_SEARCH_LIBS([strerror],[cposix])
 
 dnl ********************************
 dnl *** Check for basic programs ***
 dnl ********************************
 AC_PROG_CC()
 AM_PROG_CC_C_O()
-AC_PROG_LD()
+LT_PATH_LD([])
 AC_PROG_INSTALL()
-AC_PROG_INTLTOOL()
+IT_PROG_INTLTOOL([0.35.0])
 
 dnl **************************
 dnl *** Initialize libtool ***
@@ -55,9 +55,7 @@ LT_INIT([disable-static])
 dnl **********************************
 dnl *** Check for standard headers ***
 dnl **********************************
-AC_HEADER_STDC()
-AC_CHECK_HEADERS([stdlib.h unistd.h locale.h stdio.h errno.h time.h string.h \
-                  math.h sys/types.h sys/wait.h memory.h signal.h sys/prctl.h \
+AC_CHECK_HEADERS([unistd.h sys/types.h sys/wait.h memory.h sys/prctl.h \
                   libintl.h])
 AC_CHECK_FUNCS([bind_textdomain_codeset])
 
@@ -99,7 +97,7 @@ AC_MSG_CHECKING([PLATFORM_LDFLAGS])
 AC_MSG_RESULT([$PLATFORM_LDFLAGS])
 AC_SUBST([PLATFORM_LDFLAGS])
 
-AC_OUTPUT([
+AC_CONFIG_FILES([
 Makefile
 icons/Makefile
 icons/48x48/Makefile
@@ -116,6 +114,7 @@ themes/windowck-dark/xfwm4/Makefile
 themes/windowck-dark/unity/Makefile
 po/Makefile.in
 ])
+AC_OUTPUT
 
 dnl ***************************
 dnl *** Print configuration ***