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I have updated the patch along the lines Martin suggested.

I have omitted OS/2 from the list of supported platforms in
the doc patch as I haven't added OS/2 to anywhere else in
the docs.  My thinging has been that OS/2 is a 2nd tier
platform, and I have kept an extensive port README file in
the build directory (PC/os2emx) documenting port specific
behaviour.

The idea with the environment variable version was that it
would be less "intrusive" a change from the user POV.