From 79e28694efe68a7cac4e8e12293f8c81d53e5895 Mon Sep 17 00:00:00 2001
From: Alejandro Colomar <alx.manpages@gmail.com>
Date: Thu, 30 Dec 2021 14:09:29 +0100
Subject: [PATCH] Remove AC_HEADER_DIRENT

POSIX.1-2001 defines 'struct dirent' in <dirent.h>.  It replaces
the old 'struct direct' found in BSDs.  All of the systems that I
checked (including FreeBSD, NetBSD, and OpenBSD), now provide
<dirent.h> with 'struct dirent', as mandated by POSIX.

Since autoconf first checks <dirent.h> and only if it's missing it
checks other header files, it's clear that it will always find
<dirent.h>, so let's simplify.

GNU autoconf documentation declares this macro as obsolescent, and
acknowledges that all current systems with directory libraries
have <dirent.h>:
<https://www.gnu.org/software/autoconf/manual/autoconf-2.70/html_node/Particular-Headers.html>

Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>
---
 configure.ac  |  1 -
 lib/defines.h | 17 ++---------------
 2 files changed, 2 insertions(+), 16 deletions(-)

diff --git a/configure.ac b/configure.ac
index 1aa91452..271d1353 100644
--- a/configure.ac
+++ b/configure.ac
@@ -37,7 +37,6 @@ AM_PROG_LIBTOOL
 dnl Checks for libraries.
 
 dnl Checks for header files.
-AC_HEADER_DIRENT
 AC_HEADER_SYS_WAIT
 AC_HEADER_STDBOOL
 
diff --git a/lib/defines.h b/lib/defines.h
index 9790fdab..c35f572d 100644
--- a/lib/defines.h
+++ b/lib/defines.h
@@ -117,21 +117,8 @@ static inline void memzero(void *ptr, size_t size)
 
 #define strzero(s) memzero(s, strlen(s))	/* warning: evaluates twice */
 
-#ifdef HAVE_DIRENT_H		/* DIR_SYSV */
-# include <dirent.h>
-# define DIRECT dirent
-#else
-# ifdef HAVE_SYS_NDIR_H		/* DIR_XENIX */
-#  include <sys/ndir.h>
-# endif
-# ifdef HAVE_SYS_DIR_H		/* DIR_??? */
-#  include <sys/dir.h>
-# endif
-# ifdef HAVE_NDIR_H		/* DIR_BSD */
-#  include <ndir.h>
-# endif
-# define DIRECT direct
-#endif
+#include <dirent.h>
+#define DIRECT dirent
 
 /*
  * Possible cases: