Version 2.3 is available upstream. Please consider updating!
It seems that version 2.3 is available upstream, while the latest version in the Gentoo tree is 1.52. You think this warning is false? Read more about it here.
GeographicLib is a small set of C++ classes for converting between geographic, UTM, UPS, MGRS, and geocentric coordinates, for gravity (e.g., EGM2008), geoid, and geomagnetic field (e.g., WMM2010) calculations, and for solving geodesic problems.