This was my first attempt at a persistent (disk-based) allocator, but I aimed too high, used too many obscure C++ features and it got away from me.
You will need the version of v3c mentioned in configure.ac.in to build it.
Like I said, it contains lots of really obscure C++, if you're curious.
This project isn't being actively maintained anymore - see it's way-cooler C/C++ replacement here at SourceForge - treedb.