Implement new "if... else if... endif" semantics.

1 files changed, 21 insertions, 5 deletions

diff --git a/doc/make.texi b/doc/make.texi
index fb40d29..4ffefb9 100644
--- a/doc/make.texi
+++ b/doc/make.texi
@@ -5723,14 +5723,30 @@ else
 endif
 @end example
 
+or:
+
+@example
+@var{conditional-directive}
+@var{text-if-one-is-true}
+else @var{conditional-directive}
+@var{text-if-true}
+else
+@var{text-if-false}
+endif
+@end example
+
 @noindent
-If the condition is true, @var{text-if-true} is used; otherwise,
-@var{text-if-false} is used instead.  The @var{text-if-false} can be any
-number of lines of text.
+There can be as many ``@code{else} @var{conditional-directive}''
+clauses as necessary.  Once a given condition is true,
+@var{text-if-true} is used and no other clause is used; if no
+condition is true then @var{text-if-false} is used.  The
+@var{text-if-true} and @var{text-if-false} can be any number of lines
+of text.
 
 The syntax of the @var{conditional-directive} is the same whether the
-conditional is simple or complex.  There are four different directives that
-test different conditions.  Here is a table of them:
+conditional is simple or complex; after an @code{else} or not.  There
+are four different directives that test different conditions.  Here is
+a table of them:
 
 @table @code
 @item ifeq (@var{arg1}, @var{arg2})