-# USE_LNLOCK - Home brew exclusive, blocking file lock.
-# <none> - No locking available. User beware!
-# One of given symbols are defined if the method is discovered to
-# be available; the methods are searched in the above order.
+# LNLOCK - Home brew exclusive, blocking file lock.
+#
+# For the chosen method, WANT_AMFLOCK_mech is defined and set up as an
+# AM_CONDITIONAL. Also, LOCKING, which contains the mechanism, is substituted.