I'm trying to compile an extension on Windows using ruby extconf.rb.

However, if I try it in Cygwin or in a command window (with MinGW's bin
directory in the PATH), it fails and the mkmf.log file shows that the
"cl" executable is being run.

I don't have a "cl" on my Windows system, so I need gcc to be used.

How do I indicate to mkmf.rb that I'm running under Cygwin or MinGW?

Thanks,
Wes

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