This is a C++ library with no pkg-config file, but at least upstream provides an m4 macro to detect itself.

Upstream: Reported upstream. No feedback yet.

CC: @dimpase @embray @mkoeppe @kiwifb

Component: build: configure

Author: Michael Orlitzky

Branch: fa6e0d9

Reviewer: Isuru Fernando, Matthias Koeppe

Issue created by migration from https://trac.sagemath.org/ticket/29454