+vsys_support=yes
+ifeq "$(DISTRONAME)" "fc4"
+vsys_support=
+endif
+ifeq "$(DISTRONAME)" "fc6"
+vsys_support=
+endif
+# cannot find the required packages (see devel.pkgs) on centos5
+ifeq "$(DISTRONAME)" "centos5"
+vsys_support=
+endif
+
+ifeq "$(vsys_support)" "yes"