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> if os.getenv('OS')=='Windows_NT' then

This is probably the better test indeed.

I wanted to note there there is a special case with Cygwin.
Cygwin is an emulation of Unix under Windows, on which both common
Windows and Unix environment variables are defined.
On this platform, package.config:sub(1,1)=='/' like on Linux, but
os.getenv('OS')=='Windows_NT' like on native Windows.
So the choice for the correct test depends on whether Cygwin shall be
seen as Windows or Unix.