Error building on Windows with git-bash

[dschaefer2]

Using the Windows Terminal with git-bash as my shell, I get the following error when running swift build against the library package template, though that doesn't seem related.

$ ../swiftpm/.build/debug/swift-build --build-system swiftbuild --build-tests

 0% [------------------------------------------------------------------------------------------------------]
error: unknown Can't determine path to cmd.exe because the ComSpec environment variable is not set []

Interesting enough COMSPEC is defined (all upper case).

[jakepetroules]

May be a duplicate of or related to #186

[dschaefer2]

Appears so. Look like it's coming from TouchTool.