diff -ur BUILD/wpa_supplicant-0.6.3/src/drivers/driver_wext.c BUILD2/wpa_supplicant-0.6.3/src/drivers/driver_wext.c
--- BUILD/wpa_supplicant-0.6.3/src/drivers/driver_wext.c	2008-08-04 11:49:26.000000000 +0200
+++ BUILD2/wpa_supplicant-0.6.3/src/drivers/driver_wext.c	2008-08-04 11:49:11.000000000 +0200
@@ -251,10 +251,12 @@
 	iwr.u.param.value = value;
 
 	if (ioctl(drv->ioctl_sock, SIOCSIWAUTH, &iwr) < 0) {
-		perror("ioctl[SIOCSIWAUTH]");
+		int saved_errno = errno;
 		fprintf(stderr, "WEXT auth param %d value 0x%x - ",
 			idx, value);
-		ret = errno == EOPNOTSUPP ? -2 : -1;
+		errno = saved_errno;
+		perror("ioctl[SIOCSIWAUTH]");
+		ret = saved_errno == EOPNOTSUPP ? -2 : -1;
 	}
 
 	return ret;