compxlib.log: compxlib Program Version 6.3.01i, Xilinx Inc Source Tools => [null] ERROR:cxl[env]:11- unable to find simulator (mti_se) executables : If you are compiling simulation libraries in ISE-GUI then, specify the simulator executable path in the "Simulator Path" property under "Compile HDL Simulation Libraries" properties. If you are compiling simulation libraries using compxlib in command line then, use the -p option to specify the executable path or set the COMPXLIB_SIM_PATH environment variable. For example :- -p \modeltech_5.7\win32 or COMPXLIB_SIM_PATH = \modeltech_5.7\win32 IMPORTANT: Make sure that the license file/other environment variable for mti_se are properly set Compilation Done. Log file closed.