> Can anyone tell me the trick to building GIMP under cygwin (on Windows XP
You really mean you are building for Cygwin, not Windows?
> My immediate problem is that the GEGL make fails because execinfo.h is not
Well, most likely nobody has attempted to build GEGL for Cygwin before.
> the build should not be including this file on windows platforms.
Well, Cygwin is a Unix platform. It should not be treated as Windows.
It's just a coincidence that Cygwin runs on top of Windows.
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