Version 1.9.2 is available upstream. Please consider updating! It seems that version 1.9.2 is available upstream, while the latest version in the Gentoo tree is 1.9.1-r6. You think this warning is false? Read more about it here.
FLANN is a library for performing fast approximate nearest neighbor
searches in high dimensional spaces. It contains a collection of
algorithms we found to work best for nearest neighbor search and a
system for automatically choosing the best algorithm and optimum
parameters depending on the dataset.
FLANN is written in C++ and contains bindings for the following
languages: C, MATLAB and Python.