Flavor seems cause a lot of troubles

[Walter Schwarzenfeld]

Problem

If you really wish to overwrite the old port of "someport"
without deleting it first, set the variable "FORCE_PKG_REGISTER"
  in your environment or the "make install" command line.

FORCE_PKG_REGISTER does not work anymore.

There problems with some ports with portmaster (but is mostly no problem 
of portmaster, but of the Makefiles).

cmake => py-sphinx

textproc/xml2rfc

devel/py-gobjects

I think the maintainer have to test ports which have Flavor build 
dependencies the port also with portmaster.


And/or the user should run pkg autoremove or portmaster 
--delete-build-depends (will not solve all, but some problems).

It is the question, why build-depends not automatically removed after 
finished build - without run pkg autoremove (except it is set for some 
reason to not automatic).