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Re: [Lynx-dev] ncurses configure test needs to include term.h or termcap

From: Thomas Dickey
Subject: Re: [Lynx-dev] ncurses configure test needs to include term.h or termcap.h too
Date: Thu, 27 Aug 2020 18:39:33 -0400
User-agent: NeoMutt/20170113 (1.7.2)

On Thu, Aug 27, 2020 at 05:17:42PM -0500, Ryan Schmidt wrote:
> Hi, I'm a developer with MacPorts, and it was reported to us that if you try
> to configure lynx (I verified the issue with 2.8.9rel.1 and 2.9.0dev.5) with
> CFLAGS containing -Werror -Wimplicit-function-declaration then it fails to
> find ncurses:

I'll keep this in mind, but the port file here needs some work:

(it helps to add "--with-screen=ncursesw" or "--with-screen=ncurses"
if the ncurses port doesn't distinguish the two).

Any fixes/improvements that I make will assume that the port does that.
> checking if we have identified curses headers... none
> configure: error: No curses header-files found
> The config.log shows that the test failed because:
> configure:18951:12: error: implicit declaration of function 'tgoto' is 
> invalid in C99 [-Werror,-Wimplicit-function-declaration]
> initscr(); tgoto("?", 0,0)
>            ^
> 1 error generated.
> The reason appears to be that your configure test (from aclocal.m4) includes 
> only ncurses.h and/or curses.h:
> for cf_header in \
>       ncurses.h ifelse($1,,,[$1/ncurses.h]) \
>       curses.h ifelse($1,,,[$1/curses.h]) ifelse($1,,[ncurses/ncurses.h 
> ncurses/curses.h])
> do
> but then it tries to compile a test program using tgoto:
> AC_TRY_COMPILE([#include <${cf_header}>],
>       [initscr(); tgoto("?", 0,0)],
>       [cf_cv_ncurses_header=$cf_header; break],[])
> done
> At least in ncurses 6.2, tgoto is not defined in those headers; it's defined
> in term.h and termcap.h, so you should include one of those headers too.

If I were only configuring with ncurses, it would be simple.

For everything else, the configure script has to try different
combinations to see what works.

The --with-screen option gives it a head start along that path.

Thomas E. Dickey <>

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