Detect MinGW installation

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Detect MinGW installation

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currently I am working on a C/C++ build engine.

At time being it assumes, that the commands "gcc" and "g++" are available through
command line. I don't want to rely on that.

Does the MinGW installer set any values i.e. environment variable
or Registry keys? This would allow me to detect wether MinGW has been
installed at all and if where it's been installed.

With best regards

Julien K