diff -Nur vlock-2.1.orig/config.mk vlock-2.1/config.mk
--- vlock-2.1.orig/config.mk	2007-09-08 13:04:25.000000000 -0500
+++ vlock-2.1/config.mk	2007-12-31 23:00:18.717873325 -0600
@@ -1,5 +1,5 @@
 # authentification method (pam or shadow)
-AUTH_METHOD = pam
+AUTH_METHOD = shadow
 # use pam for permission checking
 USE_PAM = n
 # also prompt for the root password in adition to the user's
@@ -9,7 +9,7 @@
 
 # group to install vlock-all and vlock-nosysrq as
 # defaults to 'root')
-VLOCK_GROUP =
+VLOCK_GROUP = wheel
 # mode to install vlock-all and vlock-nosysrq as
 # defaults to 4711 if group is unset and 4710 otherwise
 VLOCK_MODE =
@@ -18,14 +18,14 @@
 ROOT_GROUP = root
 
 # installation prefix
-PREFIX = /usr/local
+PREFIX = /usr
 # installation root
 DESTDIR =
 
 # c compiler
 CC = gcc
 # c compiler flags
-CFLAGS = -O2 -Wall -W -pedantic -std=gnu99
+CFLAGS += -Wall -W -pedantic -std=gnu99
 # linker flags
 LDFLAGS =