Ecpg dependency

Hello,
After upgrade from 11.2 to 12.2 I found, that build of ecpg component
depends on pgcommon_shlib and pgport_shlib.  But build of ecpg
doesn't include build of pgcommon_shlib and pgport_shlib. That means, if I
want to build ecpg, first I need to build  pgcommon_shlib and pgport_shlib
and after that I am able to build ecpg.

I would like to ask if this behavior is expected or not ? Because previous
version doesn't require this separate builds.

Thanks
Filip Januš