foxtrotgps has Build-Depends: libsoup2.4-dev but doesn't use libsoup
at all. I checked with

rgrep -i soup

foxtrotgps uses Beautiful Soup (python3-bs4) which is different than libsoup.

In my follow-up email, I am attaching a patch to fix this issue

Thank you,
Jeremy Bícha

Patch attached

Thank you,
Jeremy Bícha

Dear submitter,

as the package foxtrotgps has just been removed from the Debian archive
unstable we hereby close the associated bug reports.  We are sorry
that we couldn't deal with your issue properly.

For details on the removal, please see https://bugs.debian.org/1110862

The version of this package that was in Debian prior to this removal
can still be found using https://snapshot.debian.org/.

Please note that the changes have been done on the master archive and
will not propagate to any mirrors until the next dinstall run at the
earliest.

This message was generated automatically; if you believe that there is
a problem with it please contact the archive administrators by mailing
ftpmaster@ftp-master.debian.org.

Debian distribution maintenance software
pp.
Thorsten Alteholz (the ftpmaster behind the curtain)