The source appears to have changed, as well as the version number. Flagged out of date. Here is an updated mkpkg:
https://docs.google.com/file/d/0Bxc3GdcWq-YyUnRRM296RTI1LVU/edit
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Package Details: grits 0.8-2
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| Package Base: | grits |
|---|---|
| Description: | Virtual Globe library using GTK+ and OpenGL |
| Upstream URL: | http://pileus.org/aweather/grits |
| Category: | lib |
| Licenses: | |
| Submitter: | archtux |
| Maintainer: | None |
| Last Packager: | None |
| Votes: | 2 |
| First Submitted: | 2011-08-30 15:05 |
| Last Updated: | 2013-10-02 15:56 |