Re: Porting the configure script to C99

* Thomas Dickey:

> On Fri, Dec 02, 2022 at 11:16:32PM +0100, Florian Weimer wrote:
>> * Thomas Dickey:
>> 
>> >> diff --git a/configure b/configure
>> >> index 97f6d1d5646d05c5..6db52b514b3b9a3c 100755
>> >> --- a/configure
>> >> +++ b/configure
>> >> @@ -31122,6 +31122,7 @@ else
>> >>  #line 31122 "configure"
>> >>  #include "confdefs.h"
>> >>  
>> >> +#include <stdio.h>
>> >>  #if HAVE_TERMIO_H
>> >>  #include <termio.h>
>> >>  #endif
>> >> @@ -31629,6 +31630,9 @@ else
>> >>  #line 31629 "configure"
>> >>  #include "confdefs.h"
>> >>  /* Thanks to Mike Rendell for this test.  */
>> >> +#if HAVE_UNISTD_H
>> >> +# include <unistd.h>
>> >> +#endif
>> >
>> > "middle chunk" is referring to this, I suppose.
>> >
>> > AC_INCLUDES_DEFAULT includes a lot of headers, not just this one.
>> >
>> > what problem does that #include solve?
>> 
>> Our configure says this at the top: “Generated by Autoconf
>> 2.52.20210509.”  I don't think it uses AC_INCLUDES_DEFAULT yet, it
>> seems:
>
> I was actually talking about the "newer" version of autoconf.

The newer version should be okay without it, true.

Thanks,
Florian