[easybuild] How to promote a package to a toolchain?

[Joachim Hein]

Hi,

I have build a PGI compiler (PGI/15.10-GCC-4.9.3-2.25) using EasyBuild and need 
to build more packages against it.   I tried with

toolchain = {'name': 'PGI', 'version': '15.10-GCC-4.9.3-2.25'}

inside my easyconfig, but am getting

Toolchain PGI not found, available toolchains: ...

There are other toolchains that are essentially just a compiler (e.g. 
GCC/4.9.3-2.25).  How can I promote the PGI module to a toolchain?  I hope this 
is not a major hack.

In the long run we would also need a PGI-OpenMPI toolchain - anyone interested?

Thanks and best wishes
   Joachim