From 879e6db06338166657609930768f76d8d7e7afbb Mon Sep 17 00:00:00 2001
From: Joe Nahmias <joe@nahmias.net>
Date: Fri, 7 Dec 2012 21:44:43 -0500
Subject: Imported Upstream version 1.2

---
 acinclude.m4 | 73 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 acinclude.m4

(limited to 'acinclude.m4')

diff --git a/acinclude.m4 b/acinclude.m4
new file mode 100644
index 0000000..a42461f
--- /dev/null
+++ b/acinclude.m4
@@ -0,0 +1,73 @@
+dnl
+dnl Contains the following macros
+dnl   BJNP_CHECK_IPV6
+dnl
+
+#
+# Check for AF_INET6, determines whether or not to enable IPv6 support
+# Check for ss_family member in struct sockaddr_storage
+# Taken from sane-backends
+AC_DEFUN([BJNP_CHECK_IPV6],
+[
+  AC_MSG_CHECKING([whether to enable IPv6]) 
+  AC_ARG_ENABLE(ipv6, 
+    AC_HELP_STRING([--disable-ipv6],[disable IPv6 support]), 
+      [  if test "$enableval" = "no" ; then
+         AC_MSG_RESULT([no, manually disabled]) 
+         ipv6=no 
+         fi
+      ])
+
+  if test "$ipv6" != "no" ; then
+    AC_TRY_COMPILE([
+	#define INET6 
+	#include <sys/types.h> 
+	#include <sys/socket.h> ], [
+	 /* AF_INET6 available check */  
+ 	if (socket(AF_INET6, SOCK_STREAM, 0) < 0) 
+   	  exit(1); 
+ 	else 
+   	  exit(0); 
+      ],[
+        AC_MSG_RESULT(yes) 
+        AC_DEFINE([ENABLE_IPV6], 1, [Define to 1 if the system supports IPv6]) 
+        ipv6=yes
+      ],[
+        AC_MSG_RESULT([no (couldn't compile test program)]) 
+        ipv6=no
+      ])
+  fi
+
+  if test "$ipv6" != "no" ; then
+    AC_MSG_CHECKING([whether struct sockaddr_storage has an ss_family member])
+    AC_TRY_COMPILE([
+	#define INET6
+	#include <sys/types.h>
+	#include <sys/socket.h> ], [
+	/* test if the ss_family member exists in struct sockaddr_storage */
+	struct sockaddr_storage ss;
+	ss.ss_family = AF_INET;
+	exit (0);
+    ], [
+	AC_MSG_RESULT(yes)
+	AC_DEFINE([HAS_SS_FAMILY], 1, [Define to 1 if struct sockaddr_storage has an ss_family member])
+    ], [
+		AC_TRY_COMPILE([
+		#define INET6
+		#include <sys/types.h>
+		#include <sys/socket.h> ], [
+		/* test if the __ss_family member exists in struct sockaddr_storage */
+		struct sockaddr_storage ss;
+		ss.__ss_family = AF_INET;
+		exit (0);
+	  ], [
+		AC_MSG_RESULT([no, but __ss_family exists])
+		AC_DEFINE([HAS___SS_FAMILY], 1, [Define to 1 if struct sockaddr_storage has __ss_family instead of ss_family])
+	  ], [
+		AC_MSG_RESULT([no])
+		ipv6=no
+    	  ])
+    ])
+  fi	
+])
+
-- 
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