2016-04-22 Exceptional meeting regarding VC pinning mechanism

14:00 UTC

Subject: How do we want to express recipes for particular VS versions.

New conda-build release - may be necessary for VS builds: https://github.com/conda/conda-build/releases/tag/1.20.1
```
*   Rebuild Eigen to test that the latest version works - if so we can drop [John Kirkham](https://conda-forge.hackpad.com/ep/profile/wv6uvIZX6h0)'s conda-smithy branch that tries to fix appveyor.
```
- This has all been done and works now. In some cases Python 3.4 64-bit builds on Windows have issues. That is still not understood.
Current guidance at https://github.com/conda-forge/staged-recipes/wiki/VC-features and https://github.com/conda/conda/wiki/VC-features.
How should a simple recipe look? The following is problematic in conda-build currently because the VS version isn't determined until the build environment has been resolved (i.e. after the metadata has been parsed, currently):
Should conda-build automatically express the msvc_runtime dependency?
If we had pinning capabilities within conda-build, does that become easier?
Whatever we choose, how do we maintain compatibility with defaults?

Notes: