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General
Have the results of the proposed changes been tested?
This is in preparation for the upcoming cups 2.4 release. Lots of configure flags became redundant, got sane defaults or just straight up changed, so I cleaned those up quite a bit. Some of the post_install actions are also no longer required.
Compression support is now enabled with the zlib-devel makedepend, which should speed things up with IPP printers that support it.
Testing is very much welcome.