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-rw-r--r--ext/socket/mkconstants.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/ext/socket/mkconstants.rb b/ext/socket/mkconstants.rb
index 9dce82495b..da15fb4c79 100644
--- a/ext/socket/mkconstants.rb
+++ b/ext/socket/mkconstants.rb
@@ -228,11 +228,13 @@ ip_optname_to_int(char *str, int len, int *valp)
<%= gen_name_to_int("str", "len", "valp", /\AIP_/, "IP_") %>
}
+#ifdef IPPROTO_IPV6
static int
ipv6_optname_to_int(char *str, int len, int *valp)
{
<%= gen_name_to_int("str", "len", "valp", /\AIPV6_/, "IPV6_") %>
}
+#endif
static int
tcp_optname_to_int(char *str, int len, int *valp)