Is there a stable CVS branch for NetBSD where all security bugs are fixed? How do I keep my system patched? Besides the netbsd-4-0 branch, I find that tracking netbsd-4 works well. There are more changes than just security, but releng are very conservative and I have rarely if ever had trouble from updating along a post-release stable branch. See pkgsrc/sysutils/etcmanage for scripts to help manage the build/install process. Some would say that they are not necessary, but you may still find them to be a helpful commented example.
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