gearmand contains an outdated, broken, embedded copy of AX_BOOST_BASE in
m4/ax_boost_base.m4 that contains a copy of #872256. Please remove this
copy and use the fixed one from autoconf-archive. Failing that, please
update your copy and register it with the security tracker. For more
information on registering your copy, please refer to:

https://salsa.debian.org/security-tracker-team/security-tracker/-/blob/master/data/embedded-code-copies?ref_type=heads

Helmut