From 73588a1a59eb22fc02d7f6a1b7951e60ed4d6641 Mon Sep 17 00:00:00 2001
From: Adrian Bunk <bunk@stusta.de>
Date: Sun, 7 Apr 2013 12:32:28 +0300
Subject: [PATCH] Ticket #2998: configure.ac cleanups.

Remove tests whose results are not used:
  * AC_CHECK_HEADERS of unistd.h, fcntl.h, sys/time.h, sys/types.h
  * AC_HEADER_MAJOR
  * AC_HEADER_TIME
  * AC_HEADER_DIRENT
  * AC_CHECK_FUNCS of isascii, statfs, sysconf, tcgetattr, tcsetattr, ftruncate
  * AC_FUNC_STRCOLL

AC_C_CONST is obsolete, today it is safe to assume all C compilers
support at least C89.

The INTERACTIVE UNIX that needed AC_ISC_POSIX is long dead.

Signed-off-by: Andrew Borodin <aborodin@vmail.ru>
---
 configure.ac | 17 +++--------------
 1 file changed, 3 insertions(+), 14 deletions(-)

diff --git a/configure.ac b/configure.ac
index 2c35d068b..63fef7f82 100644
--- a/configure.ac
+++ b/configure.ac
@@ -156,13 +156,10 @@ dnl ############################################################################
 dnl Check for header files
 dnl ############################################################################
 
-AC_CHECK_HEADERS([unistd.h string.h memory.h limits.h malloc.h \
-	utime.h fcntl.h sys/statfs.h sys/vfs.h sys/time.h \
+AC_CHECK_HEADERS([string.h memory.h limits.h malloc.h \
+	utime.h sys/statfs.h sys/vfs.h \
 	sys/select.h sys/ioctl.h stropts.h arpa/inet.h \
-	sys/socket.h sys/sysmacros.h sys/types.h sys/mkdev.h])
-AC_HEADER_MAJOR
-AC_HEADER_TIME
-AC_HEADER_DIRENT
+	sys/socket.h sys/sysmacros.h sys/mkdev.h])
 AC_HEADER_ASSERT
 
 
@@ -170,7 +167,6 @@ dnl ############################################################################
 dnl Check for types
 dnl ############################################################################
 
-AC_C_CONST
 dnl Check largefile before type sizeof checks
 AC_SYS_LARGEFILE
 
@@ -226,15 +222,10 @@ dnl Check for functions
 dnl ############################################################################
 
 AC_CHECK_FUNCS([\
-	isascii \
-	statfs sysconf \
-	tcgetattr tcsetattr \
-	ftruncate \
 	strverscmp \
 	strncasecmp \
 	realpath
 ])
-AC_FUNC_STRCOLL
 
 dnl getpt is a GNU Extension (glibc 2.1.x)
 AC_CHECK_FUNCS(posix_openpt, , [AC_CHECK_FUNCS(getpt)])
@@ -280,8 +271,6 @@ dnl ############################################################################
 dnl OS specific flags
 dnl ############################################################################
 
-AC_ISC_POSIX
-
 case $host_os in
 aux*)
     # A/UX