Shared object "libicuuc.so.70" not found on RPi4

When trying to start inkscape on a Pi4 running -current the
system reports:
ld-elf.so.1: Shared object "libicuuc.so.70" not found, required by "libvisio-0.1.so.1"

The inkscape port was built using poudriere and is recent, but the xorg
installation is from June, 2022. There's nothing obvious wrong with it.
No complaints while installing inkscape using pkg, so the fact that I'm
not using a desktop environment (Gnome, KDE or otherwise) seems unlikely
to be the culprit. 

Icu is present and up to date, but I can't figure out where libvisio
came from. Whereis doesn't see it, no man page.

Can anybody see what I've done wrong? For the moment I'm rebuilding xorg.

Thanks for reading,

bob prohaska