Gisle Vanem:
A patch to bypass MS' sillyness with regard to IPv6 and getaddrinfo().
The CURLDEBUG part is to avoid redefinition warning caused by memdebug.h. If
ENABLE_IPV6 isn't enabled, it doesn't matter since we never call
getaddrinfo(). Allthough we could to support weird protocols like SOCK_RDM
that Win-2K/XP has.
diff --git a/lib/setup.h b/lib/setup.h
index 11e137f..fe1613c 100644
--- a/lib/setup.h
+++ b/lib/setup.h
@@ -166,6 +166,17 @@
#define WIN32_LEAN_AND_MEAN /* Prevent including <winsock*.h> in <windows.h> */
#endif
+#if (defined(ENABLE_IPV6) || defined(CURLDEBUG)) && defined(_MSC_VER) && \
+ (!defined(_WIN32_WINNT) || _WIN32_WINNT < 0x0500)
+/*
+ * Needed to pull in the real getaddrinfo() and not the inline version
+ * in <wspiAPI.H> which doesn't support IPv6 (IPv4 only). <wspiAPI.H> is
+ * included from <ws2tcpip.h> for <= 0x0500 SDKs.
+ */
+#undef _WIN32_WINNT
+#define _WIN32_WINNT 0x0501
+#endif
+
#include <winsock2.h> /* required by telnet.c */
#if defined(ENABLE_IPV6) || defined(USE_SSLEAY)
