Commit getconf/socklen_t/largefile patch suggested by Albert Chin.

This is tested on
  Solaris 2.5.2, 2.6, 7, 8/SPARC, HP-UX 10.20, 11.00,
  Tru64 UNIX 4.0D, 5.0A, IRIX 6.2, 6.5, AIX 4.3.2
and it works ok.

This patch *requires* autoconf 2.52.

aclocal.m4

@@ -22,81 +22,6 @@ AC_DEFUN(AC_VALIDATE_CACHE_SYSTEM_TYPE, [
     ac_cv_target_system_type="$target"
 ])
 
-#serial 12
-
-dnl By default, many hosts won't let programs access large files;
-dnl one must use special compiler options to get large-file access to work.
-dnl For more details about this brain damage please see:
-dnl http://www.sas.com/standards/large.file/x_open.20Mar96.html
-
-dnl Written by Paul Eggert <eggert@twinsun.com>.
-
-dnl Internal subroutine of AC_SYS_LARGEFILE.
-dnl AC_SYS_LARGEFILE_TEST_INCLUDES
-AC_DEFUN(AC_SYS_LARGEFILE_TEST_INCLUDES,
-  [[#include <sys/types.h>
-    int a[(off_t) 9223372036854775807 == 9223372036854775807 ? 1 : -1];
-  ]])
-
-dnl Internal subroutine of AC_SYS_LARGEFILE.
-dnl AC_SYS_LARGEFILE_MACRO_VALUE(C-MACRO, VALUE, CACHE-VAR, COMMENT, INCLUDES, FUNCTION-BODY)
-AC_DEFUN([AC_SYS_LARGEFILE_MACRO_VALUE],
-  [AC_CACHE_CHECK([for $1 value needed for large files], $3,
-     [$3=no
-      AC_TRY_COMPILE(AC_SYS_LARGEFILE_TEST_INCLUDES
-$5
-        ,
-        [$6],
-        ,
-        [AC_TRY_COMPILE([#define $1 $2]
-AC_SYS_LARGEFILE_TEST_INCLUDES
-$5
-           ,
-           [$6],
-           [$3=$2])])])
-   if test "[$]$3" != no; then
-     AC_DEFINE_UNQUOTED([$1], [$]$3, [$4])
-   fi])
-
-AC_DEFUN([AC_SYS_LARGEFILE],
-  [AC_ARG_ENABLE(largefile,
-     [  --disable-largefile     omit support for large files])
-   if test "$enable_largefile" != no; then
-
-     AC_CACHE_CHECK([for special C compiler options needed for large files],
-       ac_cv_sys_largefile_CC,
-       [ac_cv_sys_largefile_CC=no
-        if test "$GCC" != yes; then
-          # IRIX 6.2 and later do not support large files by default,
-          # so use the C compiler's -n32 option if that helps.
-          AC_TRY_COMPILE(AC_SYS_LARGEFILE_TEST_INCLUDES, , ,
-            [ac_save_CC="$CC"
-             CC="$CC -n32"
-             AC_TRY_COMPILE(AC_SYS_LARGEFILE_TEST_INCLUDES, ,
-               ac_cv_sys_largefile_CC=' -n32')
-             CC="$ac_save_CC"])
-        fi])
-     if test "$ac_cv_sys_largefile_CC" != no; then
-       CC="$CC$ac_cv_sys_largefile_CC"
-     fi
-
-     AC_SYS_LARGEFILE_MACRO_VALUE(_FILE_OFFSET_BITS, 64,
-       ac_cv_sys_file_offset_bits,
-       [Number of bits in a file offset, on hosts where this is settable.])
-     AC_SYS_LARGEFILE_MACRO_VALUE(_LARGEFILE_SOURCE, 1,
-       ac_cv_sys_largefile_source,
-       [Define to make ftello visible on some hosts (e.g. HP-UX 10.20).],
-       [#include <stdio.h>], [return !ftello;])
-     AC_SYS_LARGEFILE_MACRO_VALUE(_LARGE_FILES, 1,
-       ac_cv_sys_large_files,
-       [Define for large files, on AIX-style hosts.])
-     AC_SYS_LARGEFILE_MACRO_VALUE(_XOPEN_SOURCE, 500,
-       ac_cv_sys_xopen_source,
-       [Define to make ftello visible on some hosts (e.g. glibc 2.1.3).],
-       [#include <stdio.h>], [return !ftello;])
-   fi
-  ])
-
 dnl Check for socklen_t: historically on BSD it is an int, and in
 dnl POSIX 1g it is a type of its own, but some platforms use different
 dnl types for the argument to getsockopt, getpeername, etc.  So we
@@ -108,50 +33,37 @@ dnl the moment.
 
 AC_DEFUN([TYPE_SOCKLEN_T],
 [
-   AC_MSG_CHECKING([for socklen_t])
-   AC_CACHE_VAL([lftp_cv_socklen_t],
-   [
-      lftp_cv_socklen_t=no
-      AC_TRY_COMPILE([
-         #include <sys/types.h>
-         #include <sys/socket.h>
-      ],
-      [
-        socklen_t len;
-        getpeername(0,0,&len);
-      ],
-      [
-         lftp_cv_socklen_t=yes
-      ])
-   ])
-   AC_MSG_RESULT($lftp_cv_socklen_t)
-   if test $lftp_cv_socklen_t = no; then
+   AC_CHECK_TYPE([socklen_t], ,[
       AC_MSG_CHECKING([for socklen_t equivalent])
-      AC_CACHE_VAL([lftp_cv_socklen_t_equiv],
+      AC_CACHE_VAL([rsync_cv_socklen_t_equiv],
       [
-         lftp_cv_socklen_t_equiv=int
-         AC_LANG_SAVE
-         for t in int size_t unsigned long "unsigned long"; do
-            AC_TRY_COMPILE([
-               #include <sys/types.h>
-               #include <sys/socket.h>
-            ],
-            [
-              $t len;
-              getpeername(0,0,&len);
-            ],
-            [
-               lftp_cv_socklen_t_equiv="$t"
-               break
-            ],
-	    [
-		AC_MSG_ERROR([Cannot find a type to use in place of socklen_t])
-	    ])
+         # Systems have either "struct sockaddr *" or
+         # "void *" as the second argument to getpeername
+         rsync_cv_socklen_t_equiv=
+         for arg2 in "struct sockaddr" void; do
+            for t in int size_t unsigned long "unsigned long"; do
+               AC_TRY_COMPILE([
+                  #include <sys/types.h>
+                  #include <sys/socket.h>
+
+                  int getpeername (int, $arg2 *, $t *);
+               ],[
+                  $t len;
+                  getpeername(0,0,&len);
+               ],[
+                  rsync_cv_socklen_t_equiv="$t"
+                  break
+               ])
+            done
          done
+
+         if test "x$rsync_cv_socklen_t_equiv" = x; then
+            AC_MSG_ERROR([Cannot find a type to use in place of socklen_t])
+         fi
       ])
-      AC_MSG_RESULT($lftp_cv_socklen_t_equiv)
-      AC_DEFINE_UNQUOTED(socklen_t, $lftp_cv_socklen_t_equiv,
-			[type to use in place of socklen_t if not defined])
-   fi
+      AC_MSG_RESULT($rsync_cv_socklen_t_equiv)
+      AC_DEFINE_UNQUOTED(socklen_t, $rsync_cv_socklen_t_equiv,
+			[type to use in place of socklen_t if not defined])],
+      [#include <sys/types.h>
+#include <sys/socket.h>])
 ])
-

configure.in

 dnl Process this file with autoconf to produce a configure script.
 AC_INIT(byteorder.h)
 AC_CONFIG_HEADER(config.h)
-AC_PREREQ(2.12)
+AC_PREREQ(2.52)
 
 LDFLAGS=${LDFLAGS-""}
 
@@ -28,13 +28,6 @@ fi
 
 CFLAGS="$CFLAGS -DHAVE_CONFIG_H"
 
-# look for getconf early as this affects just about everything
-AC_CHECK_PROG(HAVE_GETCONF, getconf, "yes", "no")
-if test $HAVE_GETCONF = "yes"; then
-	CFLAGS=$CFLAGS" "`getconf LFS_CFLAGS 2> /dev/null`
-	LDFLAGS=$LDFLAGS" "`getconf LFS_LDFLAGS 2> /dev/null`
-fi
-
 AC_ARG_WITH(included-popt,
         [  --with-included-popt    use bundled popt library, not from system])
 
@@ -77,8 +70,7 @@ AC_TYPE_PID_T
 AC_TYPE_GETGROUPS
 AC_STRUCT_ST_RDEV
 AC_CHECK_TYPE([ino_t], [unsigned])
-dnl TYPE_SOCKLEN_T
-AC_CHECK_TYPE([socklen_t], [size_t])
+TYPE_SOCKLEN_T
 
 AC_CACHE_CHECK([for errno in errno.h],rsync_cv_errno, [
     AC_TRY_COMPILE([#include <errno.h>],[int i = errno],