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I'm rebuilding world and would like to have every other file not created by the rebuilding of world to be deleted. Is there some mergemaster option for this?

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You can use the make targets delete-old and delete-old-libs to remove obsolete files. They run interactively, unless you set BATCH_DELETE_OLD_FILES:

# pwd
/usr/src
# make -DBATCH_DELETE_OLD_FILES delete-old

Run them after make installworld.

Have a look at build(7) for more details.

A word of warning - be careful with delete-old-libs - it will delete anything that was not built as part of the current world/kernel so if any of your installed ports rely on older versions of any system libs, you'll need to reinstall the affected ports. I usually run delete-old-libs after a complete port rebuild to avoid this problem.

  • Thank you so much! Just to be sure, though, would it delete literally everything that isn't from the build? – Nanotwerp Apr 12 '15 at 16:59
  • They will only delete obsolete files that were installed as part of the base system - executables, headers, documentation, etc. delete-old-libs will only delete obsolete shared libraries. You can use the target check-old to see what the other two would delete. – D_Bye Apr 14 '15 at 8:29

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