+# More backend sets, with the additional Windows serial-port module.
+W_BE_ALL = be_all_s winser cproxy
+W_BE_NOSSH = be_nos_s winser nocproxy
+# And with the Unix serial-port module.
+U_BE_ALL = be_all_s uxser cproxy
+U_BE_NOSSH = be_nos_s uxser nocproxy