env = getenv('TTKERNEL');if isempty(env)  error('Environment variable TTKERNEL not defined - please quit MATLAB and set this variable first.')endccd = pwd;cd(env)mex ttkernelMATLAB.cpp  cd matlabmex ttInitKernel.cppmex ttCreatePeriodicTask.cppmex ttAnalogIn.cppmex ttAnalogOut.cppmex ttCallBlockSystem.cpp  cd(ccd)