--- gnuplot-3.8k.1/src/term.c.orig 2004-03-24 00:06:23.000000000 -0800 +++ gnuplot-3.8k.1/src/term.c 2004-03-24 00:06:30.000000000 -0800 @@ -1437,7 +1437,7 @@ if (X11_Display) term_name = "x11"; /* if x11 was selected check for driver */ - if ((strcmp(term_name, "x11") == 0) && !x11driver_found()) { + if (term_name && (strcmp(term_name, "x11") == 0) && !x11driver_found()) { printf("*** X11-output-driver not found, switching to dumb terminal!\n"); printf("*** If you want to use the X-output, please install the ""gnuplot-x11""-package\n"); term_name = "dumb";