Examine the files Makedefs.alpha Makedefs.generic Makedefs.hp Makedefs.ibm Makedefs.iris Makedefs.linux Makedefs.solaris Makedefs.sun and see which one fits your system best; these are samples, and may not fit any given system exactly. Make any necessary modifications, then type make 'system' where 'system' is whichver one you chose of 'alpha', 'generic', 'hp', 'ibm', 'iris', 'linux', 'solaris', or 'sun' This sets up a symbolic link to the appropriate Makedefs, and only needs to be done once (per system). Next type make clean pnp_funnel Expect to (possibly) see a warning about the variable 'smp' being used before it is defined; this is normal. After that, you should be able to run pnp_funnel. Two commented sample input files, 'test1.input' and 'test2.input', are provided; you can try running them with the following commands: pnp_funnel < test1.input > your1.output pnp_funnel < test2.input > your2.output Then compare the files 'your1.output' against 'test1.output', and 'your2.output' against 'test2.output'. The data should be exceedingly similar. For comparison, the file 'comp1.output' contains the output of another PNP program which solved for exactly the same physical situation as specified in 'test1.input'. The first run takes about 6 seconds of CPU time on a Pentium-133, and the second about 33 seconds on the same machine.