cmdstan fails to build

[idontgetoutmuch]

Summary:

See #770. I just tried with 2.29.0 and get the same error.

Description:

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Reproducible Steps:

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Current Output:

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Expected Output:

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Additional Information:

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Current Version:

v2.29.0

[WardBrian]

I wonder if stan-dev/math#2618 could have resolved this?