security/gnupg installing pth-2.0.7 causing problems

[david at vizion2000.net]

Hi

gnupg-2.0.13 depends on devel and installs it. This causes problems on a
7.2-p3 amd64 system. A number of ports fail to build due to conflicts
between pth and the standard system thread library.

For example x11-toolkits/py-qt4-gui build fails with pth-2.0.7 installed.
After deletion py-qt4-gui builds and installs correctly.

What is the best way to deal with this when security/gnupg is required?
Would it be possible for the gnupg to detect it is on an amd64 system and
adjust its dependencies accordingly? Should the problem also be dealt with
at source in the devel/pth port?

David