+DEBIAN=$(shell expr "`cat /etc/issue`" : '.*Debian.*')
+SUSE=$(shell expr "`cat /etc/issue`" : '.*SuSE.*')
+SUSE91=$(shell expr "`cat /etc/issue`" : '.*SuSE Linux 9.1.*')
+REDHAT=$(shell expr "`cat /etc/issue`" : '.*RedHat.*')
+
+ifneq (${DEBIAN},0)
+OS:=debian
+else
+ ifneq (${SUSE91},0)
+ OS=suse91
+ else
+ ifneq (${SUSE},0)
+ OS=suse
+ else
+ ifneq (${REDHAT},0)
+ OS=redhat
+ endif
+ endif
+ endif
+endif
+
+