[DEVELOPMENT HAS BEEN DISCONTINUED] The successor of MMDAI is https://github.com/hkrn/nanoem / MMDAI was a fork project of MMDAgent and VPVM a.k.a. MMDAI2 was an application to create a motion compatible with MMD for OSX/Linux that is extended from MMDAI
In VIManager_Thread.cpp, calloc() and free() are used but cstdlib is not included, so the builds fail at least on my system (Ubuntu 11.04 amd64).
The following patch should fix this issue: