Fix build with older version of libprotobuf-c

diff --git a/configure.ac b/configure.ac
index 2dfa9d8..ec34074 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -70,7 +70,7 @@ then
 fi
 if test "x$have_protoc_c" = "xyes"
 then
-       AC_CHECK_LIB([protobuf-c], [protobuf_c_version],
+       AC_CHECK_LIB([protobuf-c], [protobuf_c_message_pack],
                     [have_protoc_c="yes"],
                     [have_protoc_c="no (libprotobuf-c not found)"])