Oleg, thank you very much indeed: simh now correctly builds the vax, vax780 and pdp11 executables. Others too, but these matter most for me. Is it possible to explain what the magic does? More precisely: what is the difference between an .a and an .so library? How on earth does -lpcap point to /usr/lib? If the answers are too lengthy or are too complex for an old Algol programmer then say so ;-) Hans -----Oorspronkelijk bericht----- Van: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] Namens Oleg Safiullin Verzonden: maandag, april 2012 8:04 Aan: hecnet at Update.UU.SE Onderwerp: Re: [HECnet] building simh On 04/09/2012 12:33 PM, hvlems at zonnet.nl wrote: Dave, I figured that out too. My system doesn't have a libpcap.a file! If I know how to build one then all would be fine. To build SimH manually wothout libpcap.a (but with libpcap.so.*) you should edit `makefile' and replace line NETWORK_OPT = -DUSE_NETWORK -isystem /usr/local/include /usr/local/lib/libpcap.a with NETWORK_OPT = -DUSE_NETWORK -isystem /usr/local/include -lpcap and then do mkdir BIN make USE_NETWORK=yes