"This package is incompatible with this version of OS X and may fail to install."
Heads up for anyone who makes packages. If you write to SIP protected locations, (even symlinks) you will get this warning.
Example:
Writing to /var - bad
Writing to /private/var - good
From now on it might be ideal to write to the full path as these are not SIP protected.
/private/etc
/private/tmp
/private/var
