If you want versions of NESL for multiple serial architectures, you will need copies of vinterp.serial, xneslplot and runnesl for each architecture. If you are using a shared file system, before building a version for a new machine, you should run make clean from the top-level directory to clean up any old object files. Before dumping the executable image of NESL (runnesl), you should make sure that the configuration points to the correct versions of vinterp.serial and xneslplot (see the next section for an explanation of configurations).