After intallation I have to update icon cache manually as desktop icon was not displayed.
INSTALLS_ICONS= yes is needed as described in https://www.freebsd.org/doc/en/books/porters-handbook/using-gnome.html
A commit references this bug:
Date: Tue Oct 4 10:58:09 UTC 2016
New revision: 423251
- Use INSTALLS_ICONS=yes
- Bump PORTREVISION