Get lsst to compile on Windows. We need to define _USE_MATH_DEFINES in order to define M_PI and similar constants. We also need to use the correct (i.e. private to this directory) export macros.
Get lsst to compile on Windows.
We need to define _USE_MATH_DEFINES in order to define M_PI and
similar constants.
We also need to use the correct (i.e. private to this directory)
export macros.

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