Exe generated in cygwin 1.7 is not running on cygwin 1.52?

The developers of Cygwin are strict about upward compatibility, but they don't try to provide backward compatibility between major releases, like between 1.5 and 1.7. This means you can build a program on 1.7 that runs on 1.5 only as long as you avoid calling functions that were added to the Cygwin DLL in 1.7.

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