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Reinstate support for OS X versions older than 10.9

Hello, I'm the maintainer of glib2 in the MacPorts package management system.

glib 2.46.0 was recently released, and attempting to configure it produces this error:

checking OSX version >= 10.9.0... no
configure: error: OSX version is too old!

glib 2.45.2 and earlier worked fine on older versions of OS X, but 2.45.3 and later claim to require 10.9.

My understanding is that the implementation of GNotification support for OS X [1] necessitated this increase in minimum OS version. But this huge jump in minimum OS version makes glib unusable on hundreds of older Mac models [2] that cannot be upgraded to OS X 10.9 that were previously able to use glib. I urge you to reconsider this action and reinstate support for older versions of OS X by making the GNotification support optional. Clearly, since GNotification support was just added, no existing apps that used glib and that already worked on OS X can have required this functionality.

I originally expressed this concern in the issue tracker [1] but was advised to bring it up on the mailing list for discussion instead.

In response to my comment in that ticket, doubt was expressed as to the usability of glib on older systems, even prior to this. I can at least tell you that Graphviz, which uses glib, worked fine all the way back to OS X 10.4, which is the earliest system I tested. I'm happy to run your test suite on older systems and report bugs for any problems found.

[1] https://bugzilla.gnome.org/show_bug.cgi?id=747146

[2] http://www.everymac.com/systems/by_capability/maximum-macos-supported.html

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