Qcl can be obtained online from: http://tph.tuwien.ac.at/~oemer/qcl.html
Qcl is difficult to compile using gcc/g++ ver. 3.x. Most Redhat systems today have both 3.x and 2.96, with 3.x being the default. It is possible to modify the default Makefile and .depend file to use g++296. Or you can download the precompiled version here
The precompiled version above has been tested with Redhat 7.3, 8.0, and 9.0. It contains the documentation from the official website in the ./doc subdirectory, as well as examples in the ./lib subdirectory.
To install,
Some example code for qcl is available here.
Execute it using
qcl b 5 i example.qcl.
The file is text, and I encourage you to look through it. If you have any
questions, e-mail me.