cygport patch: Add PATCHOPTS

[Yaakov (Cygwin Ports)]

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Christian Franke wrote:
> The attached patch adds the ability to pass patch options to cygport
> prep command.
> 
> Example: Set original timestamps from patch file (like g-b-s does):
> 
> PATCHOPTS+="-Z"

The original purpose of the -Z was to allow patching the autotool files
directly with the g-b-s, see
http://cygwin.com/ml/cygwin-apps/2004-02/msg00286.html and thread for
details.

This is not necessary with cygport because the autotools are always
regenerated, and not changes in the generated files are not included in
the patch.

Did you find this particularly necessary somehow, and why?


Yaakov
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