This basically separates the built files from the source files. So when you do a CVS update and you forgot to clean beforehand, then you can just delete the directory.
Then again, the really recommended way to "live dangerously" is to use --enable-depend. This should always be safe except when there are major reorganizations in the source tree. (Some people don't trust this, but I do.)
Yeah, that's what I do. Some of bruce's recent locale stuff broke that even so and I had to make distclean.
Chris
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