Looks like you need to install your simulator and make sure its location is properly in your search path. Ask your system admin if you don’t know where your tools are installed.
To diagnose:
Type ‘which vlib’ at your command prompt in the same terminal.
If it finds vlib OK, then the problem lies in your Makefile, altering the path or trying to find vlib in a particular place on your system, where it does not exist.
If it does NOT find vlib, then you should update your shell PATH in your .profile or .bashrc or similar. Make sure it points to your simulator install location as specified in the simulator installation documents.