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I get this error from Homebrew when trying to build an application on MacOS 10.10.5, on an exFAT filesystem

Error: parent directory is world writable but not sticky

I use this command to enable sticky-bit, but there does not seem to have any effect

$ chmod +t /Volumes/exFAT/tmp
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exFAT doesn’t support POSIX file attributes, including the sticky bit. There is no way to add it to a directory stored in an exFAT file system.

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