[PATCH] check for required libraries for compilation in configure.in

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

Index: ulogd2/configure.in
===================================================================
--- ulogd2.orig/configure.in	2008-05-18 03:03:47.000000000 +0200
+++ ulogd2/configure.in	2008-05-18 03:13:33.000000000 +0200
@@ -32,14 +32,14 @@ AC_CHECK_FUNCS(socket strerror)
 
 dnl Check for the right nfnetlink version
 LIBNFNETLINK_REQUIRED=0.0.30
-PKG_CHECK_MODULES(LIBNFNETLINK, libnfnetlink >= $LIBNFNETLINK_REQUIRED,,
-               AC_MSG_ERROR(Cannot find libnfnetlink >= $LIBNFNETLINK_REQUIRED))
+LIBNETFILTER_CONNTRACK_REQUIRED=0.0.94
+LIBNETFILTER_LOG_REQUIRED=0.0.13
 
-AC_CHECK_HEADER([libnetfilter_log/linux_nfnetlink_log.h], [AC_MSG_RESULT([found])],
-		[AC_MSG_ERROR([libnetfilter_log Version 0.0.11 or later needed])])
+PKG_CHECK_MODULES(LIBNFNETLINK, libnfnetlink >= $LIBNFNETLINK_REQUIRED,, AC_MSG_ERROR(Cannot find libnfnetlink >= $LIBNFNETLINK_REQUIRED))
 
-AC_CHECK_HEADER([libnetfilter_conntrack/libnetfilter_conntrack.h], [AC_MSG_RESULT([found])],
-		[AC_MSG_ERROR([libnetfilter_conntrack Version 0.0.11 or later needed])])
+PKG_CHECK_MODULES(LIBNETFILTER_CONNTRACK, libnetfilter_conntrack >= $LIBNETFILTER_CONNTRACK_REQUIRED,, AC_MSG_ERROR(Cannot find libnetfilter_conntrack >= $LIBNETFILTER_CONNTRACK_REQUIRED))
+
+PKG_CHECK_MODULES(LIBNETFILTER_LOG, libnetfilter_log >= $LIBNETFILTER_LOG_REQUIRED,, AC_MSG_ERROR(Cannot find libnetfilter_log >= $LIBNETFILTER_LOG_REQUIRED))
 
 AC_CHECK_LIB([netfilter_log], [nflog_get_gid],
 	     AC_DEFINE_UNQUOTED([HAVE_NFLOG_GET_GID],[1],[libnetfilter_log has GID support]),,