- Move the sys.mk filemon requirement to bsd.init.mk as a warning.
This is intended only to show when building directly in a subdirectory
without filemon loaded.
- Move the error into Makefile and only apply it when building
from the META_TGT_WHITELIST target list.
-DNO_FILEMON can be used to suppress both the warning and the error but
makes WITH_META_MODE less useful. It will only compare build commands
in this mode rather than track all dependencies.
This fixes installing from a jail which doesn't need filemon in this
phase [1].
Reported by: Nikolai Lifanov <lifanov@mail.lifanov.com> [1]
Approved by: re (implicit)
Sponsored by: EMC / Isilon Storage Division
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