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-rw-r--r--ext/socket/socket.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/ext/socket/socket.c b/ext/socket/socket.c
index 16442b444b7..17aa3661c58 100644
--- a/ext/socket/socket.c
+++ b/ext/socket/socket.c
@@ -2643,5 +2643,9 @@ Init_socket()
/* constants */
mConst = rb_define_module_under(rb_cSocket, "Constants");
- #include "constants.h"
+#include "constants.h"
+#ifdef INET6 /* IPv6 is not supported although AF_INET6 is defined on bcc32/mingw */
+ sock_define_const("AF_INET6", AF_INET6);
+ sock_define_const("PF_INET6", PF_INET6);
+#endif
}