--- a/configure.ac	Sat Mar 01 10:29:22 2014 -0800
+++ b/configure.ac	Sun Mar 02 01:45:23 2014 +0100
@@ -1133,6 +1133,9 @@
 		AC_DEFINE_UNQUOTED(GG_CONFIG_GNUTLS_SYSTEM_TRUST_STORE, ["$gg_gnutls_sts"], [use the given file as GnuTLS default trust store])
 	fi
 
+	PKG_CHECK_MODULES([GNUTLS_2_10], [gnutls >= 2.10.0], [
+		AC_DEFINE([HAVE_GNUTLS_2_10], [], [Defined if GnuTLS >= 2.10.0 is available.])
+	])
 fi
 
 if test "x$gadu_libs" = "x"; then