From 1eaa30756eaa696e8a24cae52e38c5819763bf91 Mon Sep 17 00:00:00 2001
From: Alejandro Colomar <alx@kernel.org>
Date: Fri, 2 Dec 2022 16:58:12 +0100
Subject: [PATCH] Assume <errno.h> exists
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ISO C99 requires <errno.h>.

Many files in the project already include <errno.h> unconditionally,
so it's reasonable to assume that it is always available.

Link: <https://github.com/shadow-maint/shadow/pull/600>
Cc: Christian Göttsche <cgzones@googlemail.com>
Cc: Iker Pedrosa <ipedrosa@redhat.com>
Cc: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
---
 configure.ac  | 2 +-
 lib/defines.h | 4 +---
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/configure.ac b/configure.ac
index c39da0f0..6dc5e953 100644
--- a/configure.ac
+++ b/configure.ac
@@ -36,7 +36,7 @@ LT_INIT
 dnl Checks for libraries.
 
 dnl Checks for header files.
-AC_CHECK_HEADERS(crypt.h errno.h fcntl.h limits.h unistd.h sys/time.h utmp.h \
+AC_CHECK_HEADERS(crypt.h fcntl.h limits.h unistd.h sys/time.h utmp.h \
 	utmpx.h termios.h termio.h sgtty.h sys/ioctl.h syslog.h paths.h \
 	utime.h ulimit.h sys/capability.h sys/random.h sys/resource.h \
 	gshadow.h lastlog.h locale.h rpc/key_prot.h netdb.h acl/libacl.h \
diff --git a/lib/defines.h b/lib/defines.h
index a47f2571..a849e5a7 100644
--- a/lib/defines.h
+++ b/lib/defines.h
@@ -48,9 +48,7 @@ extern char * textdomain (const char * domainname);
 #include <stdlib.h>
 #include <string.h>
 
-#if HAVE_ERRNO_H
-# include <errno.h>
-#endif
+#include <errno.h>
 
 #include <sys/stat.h>
 #include <sys/types.h>