Resolution:
In the 5.2.1 adapter there are custom function declarations like convertRVTX2MQ and convertMQ2RVTX. These functions use RVTX variables like tibrvtxTransport. These function declarations and definitions should not be commented out.

The Makefile needs to have the following in place:

TIBRVTX_DIR=&ltPath of the TIBRVTX>
INCFILES=-I$(TIBRV_DIR)/include -I$(MQM_DIR)/inc -I$(TIBRVTX_DIR)/include

The reason is that the runtime adapter does have a dependency of RVTX related linker symbols and the adapter would start properly only if the RVTX symbols are found in the custom conversion library.

This restriction has been removed from the 5.3.0 version of the adapter.