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Hi, I'm trying to build a pex that references a `python_requirements_library` and getting this. Whats the best way to debug it?
```Exception message: Package SourcePackage(u'file:///aiq/build/.pants.d/python-setup/resolved_requirements/CPython-2.7.6/mysqlclient-1.4.6.tar.gz') is not translateable by ChainedTranslator(WheelTranslator, EggTranslator, SourceTranslator)```
`-ldebug` doesnt tell me much. I do have a build cache but disabled it, and `python-repos`  is only pointing to a local dir with only that wheel. And this works fine:
```pip wheel --no-cache-dir mysqlclient==1.4.6 --wheel-dir=./
pip install ./mysqlclient-xxx-none-linux.whl```
I'm on ubuntu14 and ub18 and noticed in one case, it builds a `none`  wheel, in another case it builds `cp27mu`. But fails to `pants1.7 binary :mypex` in both cases.

Try running with PEX_VERBOSE=9 PEX_DEBUG=9 (I forget which is relevant here) in your environment, that may give something useful.

That worked! (I mean, still fails, but gave me info to debug further). Thanks.

I suppose I should have checked the pex docs, not the pants docs. FYI I'm on 1.7, does newer pants make `-ldebug` get passed on to each various goal?