autoconf bug (emacs 21.3.50)

[John Owens]

Here was the CVS retrieval this morning:

  cvs -d:pserver:address@hidden:/cvsroot/emacs login
    (type RETURN when asked for a password)
  cvs -z3 -d:pserver:address@hidden:/cvsroot/emacs co emacs

And here was the bug.

JDO

checking net/if.h usability... no
checking net/if.h presence... yes
configure: WARNING: net/if.h: present but cannot be compiled
configure: WARNING: net/if.h: check for missing prerequisite headers?
configure: WARNING: net/if.h: proceeding with the preprocessor's
result
configure: WARNING:     ## ------------------------------------ ##
configure: WARNING:     ## Report this to address@hidden ##
configure: WARNING:     ## ------------------------------------ ##