device_class only exists as a patch to Red Hat pciutils. This diff is based on
reversing r1.108.

-Donnie Berkholz <dberkholz@gentoo.org>

--- pci.c.orig	2006-09-01 14:39:55.000000000 -0700
+++ pci.c	2006-09-01 14:41:28.000000000 -0700
@@ -297,7 +297,7 @@
 #endif	
 	unsigned int devtype, command;
 	
-	devtype = p->device_class;
+	devtype = config[PCI_CLASS_DEVICE+1] << 8 | config[PCI_CLASS_DEVICE];
 	if (p->irq || pciToKudzu(devtype) != CLASS_VIDEO) {
 		return 0;
 	}
@@ -420,13 +420,13 @@
 		dev->subDeviceId = subdev;
 		dev->pciType = bustype;
 		asprintf(&t,"v%08Xd%08Xsv%08Xsd%08Xbc%02Xsc%02Xi%02x",p->vendor_id,p->device_id,
-			 subvend, subdev,(u_int8_t)(p->device_class >> 8),(u_int8_t)(p->device_class),config[PCI_CLASS_PROG]);
+			 subvend, subdev,(u_int8_t)(config[PCI_CLASS_DEVICE+1] << 8),(u_int8_t)(config[PCI_CLASS_DEVICE]),config[PCI_CLASS_PROG]);
 		drv = aliasSearch(aliases, "pci", t);
 		x_drv = aliasSearch(aliases, "pcivideo", t);
 		free(t);
 		if (drv)
 			dev->driver = strdup(drv);
-		devtype = p->device_class;
+		devtype = config[PCI_CLASS_DEVICE+1] << 8 | config[PCI_CLASS_DEVICE];
 		if (x_drv) {
 			dev->classprivate = strdup(x_drv);
 		}