$ pkg version -vl "<"
libgd-2.3.3_1,1 < needs updating (index has 2.3.3_4,1)
という状態になっておりまして、これをアップグレードしようとすると
portupgrade libgd
[Reading data from pkg(8) ... - 544 packages found - done]
** Port marked as IGNORE: graphics/gd:
is marked as broken: option AVIF has a circular dependency loop
** Listing the failed packages (-:ignored / *:skipped / !:failed)
- graphics/gd (marked as IGNORE)