-DEBIAN=$(shell expr "`cat /etc/issue`" : '.*Debian.*')
-SUSE=$(shell expr "`cat /etc/issue`" : '.*SuSE.*')
-REDHAT=$(shell expr "`cat /etc/issue`" : '.*RedHat.*')
+DEBIAN=$(shell expr "`cat /etc/issue 2> /dev/null`" : '.*Debian.*')
+SUSE=$(shell expr "`cat /etc/issue 2> /dev/null`" : '.*SuSE.*')
+SUSE91=$(shell expr "`cat /etc/issue 2> /dev/null`" : '.*SuSE Linux 9.1.*')
+REDHAT=$(shell expr "`cat /etc/issue 2> /dev/null`" : '.*Red Hat.*')
+MANDRAKE=$(shell expr "`cat /etc/issue 2> /dev/null`" : '.*Mandrake.*')
+DARWIN=$(shell expr "`uname -a`" : '.*Darwin.*')
+UBUNTU=$(shell expr "`cat /etc/issue 2> /dev/null`" : '.*Ubuntu.*')
+