guile-2.2 uses libxcrypt during build, but it also exposes this header
to its downstreams by including -lcrypt in its pkgconf .pc file. There
is an effort[1] to drop libcrypt-dev from the build-essential package
set. This will not happen during the trixie freeze, but some months into
the forky cycle. Once dropped, guile-2.2 and reverse dependencies of
guile-2.2-dev will fail to build from source. I'm attaching a patch to
make these dependencies explicit. It is safe for inclusion into trixie,
but it does not warrant an upload of its own at this time of the freeze.

Helmut

[1] https://lists.debian.org/debian-devel/2025/04/msg00113.html

Dear submitter,

as the package guile-2.2 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/1121731

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)