It's my first bug report, so, sorry for any errors and for my English.
Port graphics/maim hardcodes as dependency libslopy version 7.5, but x11/slop is now version 7.6, so it doesn't find the library.
I did not test changing the version number yet
Axey Gabriel Muller Endres
Thank you so much for your report.
I've fixed the issue in https://cgit.freebsd.org/ports/commit/?id=1eba9ee23931bd91682394e8adc5698ea0be4952. Maim should be available in the package repositories again shortly.