It's a project I started a couple of years ago, a T*-tree binary tree implementation written in C (see http://en.wikipedia.org/wiki/T-tree). I have never had enough time to nail it down. May be placing it here will motivate me (or somebody else) to give this project some love it definitely needs.
% cd libttree
% cmake CMakeLists.txt
...
% make
% ls libttree.a // that's the library file