The patch for the bloch sphere against the most up-to-date version of the QCL(QCL-0.5.0) is available
here(http://www.redbrick.dcu.ie/ hego/project/bloch_sphere.patch). To apply this patch, copy the patch
file into /tmp. Download a copy of the QCL source code and untar and unzip it with the following command;
tar zxvf qcl-0.5.0.tgz
Change directory into the qcl-0.5.0 directory. Then apply the patch, with this command;
patch 
/tmp/bloch_sphere.patch
The code now needs to be compiled. Firstly, alter the Makefile to suit your system. Then create the .depend
file with;
make dep
To compile the code then type;
make