The source can be downloaded from here:
QLink.c: 11 KB - the main source file
MathSide.tm: 5 KB - the meta-language file transformed my mprep into a c code
Makefile: 2 KB - a makefile for gcc on the x86-64 Linux platform
QLink.mak: 2 KB - a makefile for Microsoft Visual C++
To compile QLink one needs to have QDBM installed.