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SWT/Devel/Gtk/Errors after repository reset
Background
Sometimes you need to do a hard reset of the SWT repository in order to fix a change. This will reset the repository to the HEAD state, but you will loose also changes you made. You will notice after doing a hard reset that many SWT files have import statement errors.
Solution
When you do a hard reset, the .classpath file is also wiped out. This means that the original .classpath_gtk is back: simply rename this file from .classpath_gtk to .classpath. Clean your workspace, and the errors will be gone. This seems pretty self explanatory but it's easy to forget this step if you haven't set up a new Eclipse environment in awhile.