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

From: Ryan Schmidt
Subject: [Lynx-dev] ncurses configure test needs to include term.h or termcap.h too
Date: Thu, 27 Aug 2020 17:17:42 -0500

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 

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 

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],[])

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.

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