cc -O -o tulip-diag tulip-diag.c tulip-diag.c: In function `scan_proc_bus_pci': tulip-diag.c:281: `f0' undeclared (first use this function) tulip-diag.c:281: (Each undeclared identifier is reported only once tulip-diag.c:281: for each function it appears in.) tulip-diag.c: In function `scan_proc_pci': tulip-diag.c:329: `f0' undeclared (first use this function)