Dear maintainer(s),

I noticed that package pan-diffraction recommends gcrystal, which is
currently not available in unstable.

See:

- https://tracker.debian.org/pkg/gcrystal

gcrystal is not available in trixie, forky neither sid. It was removed
from testing in 2025.

Likely, the recommendation needs to be removed. I don't know if it
should have something else instead of gcrystal (I am not familiar with
that packages).

PS[0]: I am developing a tool to detect such issues:
https://salsa.debian.org/carlespina/check-relations . Reports are
manually reviewed before submission. If you would prefer not to receive
such reports (for specific packages, all of your maintained packages,
etc.), please let me know. Any other feedback is welcomed as well. No
more bugreports for this missing relation will be sent.

PS[1]: more information available in
https://salsa.debian.org/carlespina/check-relations/-/blob/main/README.md
and
https://salsa.debian.org/carlespina/check-relations/-/blob/main/docs/bug-report-extra-info.md