Bug#1143281: ams: FTBFS: configure.ac:22: error: Macro PKG_PROG_PKG_CONFIG is not available. It is usually

Package: src:ams
Version: 2.2.1-2
Severity: serious
Tags: ftbfs forky sid

Dear maintainer:

During a rebuild of all packages in unstable, this package failed to build.

Below you will find the last part of the build log (probably the most
relevant part, but not necessarily). If required, the full build log
is available here:

https://people.debian.org/~sanvila/build-logs/202608/

About the archive rebuild: The build was made on virtual machines from AWS,
using sbuild and a reduced chroot with only build-essential packages.

If you cannot reproduce the bug please contact me privately, as I
am willing to provide ssh access to a virtual machine where the bug is
fully reproducible.

If this is really a bug in one of the build-depends, please use
reassign and add an affects on src:ams, so that this is still
visible in the BTS web page for this package.

Thanks.

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[...]
 debian/rules clean
dh clean
   dh_clean
 debian/rules binary
dh binary
   dh_update_autotools_config
   dh_autoreconf
autoreconf: export WARNINGS=
autoreconf: Entering directory '.'
autoreconf: configure.ac: no obvious need to run autopoint
autoreconf: running: aclocal --force 
configure.ac:22: error: Macro PKG_PROG_PKG_CONFIG is not available. It is usually
defined in file pkg.m4 provided by package pkg-config.

configure.ac:22: the top level
autom4te: error: /usr/bin/m4 failed with exit status: 1
aclocal: error: /usr/bin/autom4te failed with exit status: 1
autoreconf: error: aclocal failed with exit status: 1
dh_autoreconf: error: autoreconf -f -i -v returned exit code 1
make: *** [debian/rules:7: binary] Error 255
dpkg-buildpackage: error: debian/rules binary subprocess failed with exit status 2
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