In compiling TBB, a conda-forge contributor ran across issues with CMake
not finding the VS compiler for VS 2008 Win64.

https://github.com/conda-forge/staged-recipes/pull/533

The exact error is at
https://ci.appveyor.com/project/conda-forge/staged-recipes/build/1.0.2118/job/t2axdaotmty35j6k#L216

Appveyor is an interesting platform, in that they install VS 2008 Express,
then the VS compiler for Python (which adds the 64-bit compilation support).

How does CMake find compilers?  Does it need extra instruction of some sort
here?

This is occurring in the context of a conda build, so we have already run
the appropriate vcvars*.bat script by the time CMake runs  (
https://ci.appveyor.com/project/conda-forge/staged-recipes/build/1.0.2118/job/t2axdaotmty35j6k#L185)
- but I'm not sure that really influences CMake's ability to find the
compiler.

Any guidance much appreciated.

Best,
Michael
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