--- autoconf.texi.~1.771.~	1970-01-01 10:00:01.000000000 +1000
+++ autoconf.texi	2003-10-31 07:03:05.000000000 +1000
@@ -3560,6 +3560,20 @@
 On MINGW, a call @code{putenv("FOO=")} removes @samp{FOO} from the
 environment, rather than inserting it with an empty value.
 
address@hidden @code{signal} handler
address@hidden @fuindex signal
address@hidden @code{signal}
+Normally @code{signal} takes a handler function with a return type of
address@hidden, but POSIX allows it to require @code{int} instead.  Any
+actual @code{int} value returned is not used, this is only a
+difference in the function prototype demanded.
+
+All systems we know of in current use take @code{void}.  Presumably
address@hidden was allowed in order to support K&R C, where of course
address@hidden is not available.  @code{AC_TYPE_SIGNAL}
+(@pxref{Particular Types}) can be used to establish the correct type
+in all cases.
+
 @item @code{snprintf}
 @c @fuindex snprintf
 @prindex @code{snprintf}