With the present code, a binary distribution should not be made with the MongoDB C driver ON. This is because the Mongo libs are currently statically linked to CONNECT. If so, a binary distribution would not allow to use CONNECT without the same version of the C driver be installed. If you intend to make binary distributions that enable the C driver, tell me about this and I'll make linking the MongoDB library dynamically as I do for the Java JVM lib (this to make possible to use a JDBC enabled distribution on a machine where Java is not installed).
However, MONGO_SUPPORT should be ON to enable using the MongDB Java Driver.