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+Luke summarized it to this :
+
+> git remote add upstream https://github.com/crosire/d3d8to9
+> git fetch upstream
+> git rebase upstream/master
+> git push -f
+
+> Now our own submodule fork is updated to upstream with our own cxbx-r changes
+
+> then in the Cxbx-Reloaded root
+
+> git add import/d3d8to9
+> then git commit and git push as normal
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