socket/extconf.rb: check struct in_addr6

* ext/socket/extconf.rb: check struct in_addr6, which is defined in
  VC6 instead of in6_addr.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40192 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 4 insertions, 0 deletions

diff --git a/ext/socket/extconf.rb b/ext/socket/extconf.rb
index 0a37a9b7c5..a168404ae3 100644
--- a/ext/socket/extconf.rb
+++ b/ext/socket/extconf.rb
@@ -477,6 +477,10 @@ EOS
 
   if getaddr_info_ok == :wide or
       !have_func("getnameinfo", headers) or !have_func("getaddrinfo", headers)
+    if !have_type("struct in6_addr", headers) and have_type("struct in_addr6", headers)
+      $defs.pop(2)
+      $defs << "-Din_addr6=in6_addr"
+    end
     if have_struct_member("struct in6_addr", "s6_addr8", headers)
       $defs[-1] = "s6_addr=s6_addr8"
     end