Orbacus installation trouble with Watcom 10.6 on Qnx4.25

I tried to install Orbacus 4.x or 3.x on Qnx 4.25 using Watcom 10.6.
It was not a good idea, cause nothing works.
Orbacus support advises me to upgrade environment and to change compiler to
It is not so easy to do that, we have applications which work properly with
this configuration.
Anyway I heard it is possible to install Orbacus using Watcom on Qnx4, I
have to recreate makefiles…

Does someone already do that?