Added support for Avahi mDNS advertisement

configure.in

@@ -21,6 +21,8 @@ AC_SUBST(LIBVIRT_VERSION)
 AC_SUBST(LIBVIRT_VERSION_INFO)
 AC_SUBST(LIBVIRT_VERSION_NUMBER)
 
+AVAHI_REQUIRED="0.6.0"
+
 dnl Checks for programs.
 AC_PROG_CC
 AC_PROG_INSTALL
@@ -232,6 +234,9 @@ if test "$with_qemu" = "yes" ; then
                    AC_MSG_ERROR([You must install kernel-headers in order to compile libvirt]))
 fi
 
+dnl Need to test if pkg-config exists
+PKG_PROG_PKG_CONFIG
+
 dnl ==========================================================================
 dnl find libxml2 library, borrowed from xmlsec
 dnl ==========================================================================
@@ -300,6 +305,27 @@ AC_CHECK_TYPE(gnutls_session,
 		[enable GnuTLS 1.0 compatibility macros]),,
 	[#include <gnutls/gnutls.h>])
 
+
+dnl Avahi library
+AC_ARG_WITH(avahi,
+  [  --with-avahi         use avahi to advertise remote daemon],
+  [],
+  [with_avahi=check])
+
+if test "$with_avahi" = "check" -a "x$PKG_CONFIG" != "x" ; then
+  PKG_CHECK_EXISTS(avahi-client >= $AVAHI_REQUIRED, [with_avahi=yes], [with_avahi=no])
+fi
+
+AVAHI_CFLAGS=
+AVAHI_LIBS=
+if test "$with_avahi" = "yes"; then
+  PKG_CHECK_MODULES(AVAHI, avahi-client >= $AVAHI_REQUIRED)
+  AC_DEFINE_UNQUOTED(HAVE_AVAHI, 1, [whether Avahi is used to broadcast server presense])
+fi
+AM_CONDITIONAL(HAVE_AVAHI, [test "$with_avahi" = "yes"])
+AC_SUBST(AVAHI_CFLAGS)
+AC_SUBST(AVAHI_LIBS)
+
 dnl virsh libraries
 AC_CHECK_LIB(curses, initscr, 
 	[VIRSH_LIBS="$VIRSH_LIBS -lcurses"],
@@ -485,6 +511,11 @@ AC_MSG_NOTICE([])
 AC_MSG_NOTICE([Libraries])
 AC_MSG_NOTICE([])
 AC_MSG_NOTICE([  libxml: $LIBXML_CFLAGS $LIBXML_LIBS])
+if test "$with_avahi" = "yes" ; then
+AC_MSG_NOTICE([   avahi: $AVAHI_CFLAGS $AVAHI_LIBS])
+else
+AC_MSG_NOTICE([   avahi: no])
+fi
 AC_MSG_NOTICE([])
 AC_MSG_NOTICE([Miscellaneous])
 AC_MSG_NOTICE([])