passfd: Fix link error on AIX 5.2.

[pspp] / m4 / afunix.m4

diff --git a/m4/afunix.m4 b/m4/afunix.m4
index fdedeba67398adedd7c5f00659510084edfed7a6..46b3bf34430b686612741d2d5e2bb16947c2e273 100644 (file)
--- a/m4/afunix.m4
+++ b/m4/afunix.m4
@@ -1,4 +1,4 @@
-# afunix.m4 serial 3
+# afunix.m4 serial 5
 dnl Copyright (C) 2011 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
@@ -38,11 +38,16 @@ AC_DEFUN([gl_SOCKET_AFUNIX],
       [Define to 1 if <sys/socket.h> defines SCM_RIGHTS.])
   fi
 
+  dnl Persuade AIX 5.2 <sys/socket.h> to declare CMSG_SPACE, CMSG_LEN.
+  AC_DEFINE([_LINUX_SOURCE_COMPAT], [1],
+    [Define in order to get some macros on AIX systems.])
+
   AC_MSG_CHECKING([for UNIX domain sockets SCM_RIGHTS that behave in BSD4.4 way])
   AC_CACHE_VAL([gl_cv_socket_unix_scm_rights_bsd44_way],
     [AC_COMPILE_IFELSE(
        [AC_LANG_PROGRAM(
           [[#include <sys/types.h>
+            #include <stddef.h>
             #ifdef HAVE_SYS_SOCKET_H
             #include <sys/socket.h>
             #endif
@@ -57,7 +62,6 @@ AC_DEFUN([gl_SOCKET_AFUNIX],
               struct cmsghdr *cmsg;
               int myfds[1] = {0};
               char buf[CMSG_SPACE (sizeof (myfds))];
-              int *fdptr;
 
               msg.msg_control = buf;
               msg.msg_controllen = sizeof buf;