Updating BUILDLINK_API_DEPENDS.pkg in buildlink3.mk

[Aleksey Cheusov <vle%gmx.net@localhost>]

pkgsrc.txt says

    14.2.2. Updating BUILDLINK_API_DEPENDS.pkg in buildlink3.mk files

    The situation that requires increasing the dependency listed in
    BUILDLINK_API_DEPENDS.pkg after a package update is when the API or
    interface to the header files change.

    In this case, BUILDLINK_API_DEPENDS.pkg should be adjusted to
    require at least the new package version. _In some cases_, the
    packages that depend on this new version may need their PKGREVISIONs
    increased and, if they have buildlink3.mk files, their
    BUILDLINK_API_DEPENDS.pkg adjusted, too.

Can anybody explain "In some cases"?  When it we should dump package's
revision and when this step is not necessary.

-- 
Best regards, Aleksey Cheusov.

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