$ pkg-config --cflags xmlb
Package libzstd was not found in the pkg-config search path.
Perhaps you should add the directory containing `libzstd.pc'
to the PKG_CONFIG_PATH environment variable
Package 'libzstd', required by 'xmlb', not found
$


This is hidden by the only user (fwupd) already having a build
dependency on libzstd-dev in trixie and sid, but broke with
backporting the new libxmlb version to bookworm.

fwupd is not the only user, but the only one in bookworm where this bug
is not hidden by a direct or indirect build dependency on libzstd-dev.

cu
Adrian

We believe that the bug you reported is fixed in the latest version of
libxmlb, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 1140908@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Mario Limonciello <superm1@debian.org> (supplier of updated libxmlb package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Sun, 28 Jun 2026 12:29:07 -0500
Source: libxmlb
Built-For-Profiles: derivative.ubuntu noudeb
Architecture: source
Version: 0.3.27-1
Distribution: unstable
Urgency: medium
Maintainer: Debian EFI team <debian-efi@lists.debian.org>
Changed-By: Mario Limonciello <superm1@debian.org>
Closes: 1140908
Changes:
 libxmlb (0.3.27-1) unstable; urgency=medium
 .
   * New upstream version
   * d/control: Add libzstd-dev to libxmlb-dev Depends (Closes: #1140908)
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