conditionals in Makefile.am

[Wesley Smith]

> From the automake manual:

You may only test a single variable in an if statement, possibly
negated using ‘!’. The else statement may be omitted. Conditionals may
be nested to any depth. You may specify an argument to else in which
case it must be the negation of the condition used for the current if.
Similarly you may specify the condition that is closed on the endif
line:

     if DEBUG
     DBG = debug
     else !DEBUG
     DBG =
     endif !DEBUG


What's the purpose of "specifying the condition that is closed"?  I've
never seen this kind of construct before.  Is it a substitute for
elseif?

wes