build-sys: add AM_PROG_AR

This silences these warnings when running bootstrap.sh:

/usr/share/automake-1.13/am/ltlibrary.am: warning: 'module-augment-properties.la': linking libtool libraries using a non-POSIX
/usr/share/automake-1.13/am/ltlibrary.am: archiver requires 'AM_PROG_AR' in 'configure.ac'
augment/Makefile.am:1:   while processing Libtool library 'module-augment-properties.la'
/usr/share/automake-1.13/am/ltlibrary.am: warning: 'module-dir-watch.la': linking libtool libraries using a non-POSIX
/usr/share/automake-1.13/am/ltlibrary.am: archiver requires 'AM_PROG_AR' in 'configure.ac'
augment/Makefile.am:1:   while processing Libtool library 'module-dir-watch.la'
augment/Makefile.am: installing './depcomp'
/usr/share/automake-1.13/am/ltlibrary.am: warning: 'module-combine-sink.la': linking libtool libraries using a non-POSIX
/usr/share/automake-1.13/am/ltlibrary.am: archiver requires 'AM_PROG_AR' in 'configure.ac'
combine/Makefile.am:1:   while processing Libtool library 'module-combine-sink.la'
/usr/share/automake-1.13/am/ltlibrary.am: warning: 'module-murphy-ivi.la': linking libtool libraries using a non-POSIX
/usr/share/automake-1.13/am/ltlibrary.am: archiver requires 'AM_PROG_AR' in 'configure.ac'
murphy/Makefile.am:14:   while processing Libtool library 'module-murphy-ivi.la'

Change-Id: Ie802041272952e581d900b5edef91d682192c0f8

diff --git a/configure.ac b/configure.ac
index ed66f73..82ab1c0 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -23,6 +23,7 @@ AC_PROG_CC_C99
 AM_PROG_CC_C_O
 AC_PROG_GCC_TRADITIONAL
 AC_USE_SYSTEM_EXTENSIONS
+AM_PROG_AR
 
 AC_PATH_PROG([M4], [m4 gm4], [no])
 if test "x$M4" = xno ; then