I have added <XILINX>/11.1/common to my path. However, when I attempt to run the command "sysgen", I receive a message stating it is not found.
The actual location of the "sysgen" command is one directory up at: <XILINX>/11.1 where <XILINX> is the Xilinx tools installation directory.
Instead of adding <XILINX>/11.1/common to your path, you should add <XILINX>/11.1.
This will be corrected in the documentation for the next release.