Version 3.2.4 is available upstream. Please consider updating! It seems that version 3.2.4 is available upstream, while the latest version in the Gentoo tree is 3.2.3. You think this warning is false? Read more about it here.
Boolector is a Satisfiability Modulo Theories (SMT) solver for the theories
of fixed-size bit-vectors, arrays and uninterpreted functions. It supports
the SMT-LIB logics BV, QF_ABV, QF_AUFBV, QF_BV and QF_UFBV. Boolector
provides a rich C and Python API and supports incremental solving, both
with the SMT-LIB commands push and pop, and as solving under assumptions.