Added a bunch of #ifdef directives to make wpcap.dll (WinPcap) compile under cygwin.

cygwin finally ships with ws2tcpip.h, so we need to get rid of some duplicated definitions.

Win32/Include/addrinfo.h

@@ -90,6 +90,29 @@ extern struct hostent *getipnodebyaddr (const void *, size_t, int, int *);
 extern struct hostent *getipnodebyname (const char *, int, int, int *);
 extern int inet_pton (int, const char *, void *);
 extern const char *inet_ntop (int, const void *, char *, size_t);
+#else
+
+#ifndef EAI_BADHINTS
+#define EAI_BADHINTS	12
+#endif 
+
+#ifndef EAI_PROTOCOL	
+#define EAI_PROTOCOL	13
+#endif
+
+#ifndef EAI_MAX	
+#define EAI_MAX		14
+#endif
+
+#ifndef NETDB_INTERNAL
+#define	NETDB_INTERNAL	-1	/* see errno */
+#endif
+
+#ifndef AI_MASK
+/* valid flags for addrinfo */
+#define	AI_MASK		(AI_PASSIVE | AI_CANONNAME | AI_NUMERICHOST)
+#endif
+
 #endif /* HAVE_ADDRINFO */
 
 /*
@@ -120,3 +143,4 @@ extern const char *inet_ntop (int, const void *, char *, size_t);
 #ifndef NI_DGRAM
 #define	NI_DGRAM	0x00000010
 #endif
+

Win32/Include/ip6_misc.h

@@ -27,9 +27,7 @@
 
 #include <winsock2.h>
 
-#ifndef __MINGW32__
 #include <ws2tcpip.h>
-#endif /* __MINGW32__ */
 
 #ifndef __MINGW32__
 #define	IN_MULTICAST(a)		IN_CLASSD(a)
@@ -39,7 +37,7 @@
 
 #define	IN_LOOPBACKNET		127
 
-#ifdef __MINGW32__
+#if defined(__MINGW32__) && defined(DEFINE_ADDITIONAL_IPV6_STUFF)
 /* IPv6 address */
 struct in6_addr
   {
@@ -60,12 +58,12 @@ struct in6_addr
 #endif /* __MINGW32__ */
 
 
-#if (defined WIN32) || (defined __MINGW32__)
+#if (defined _MSC_VER) || (defined(__MINGW32__) && defined(DEFINE_ADDITIONAL_IPV6_STUFF))
 typedef unsigned short	sa_family_t;
 #endif
 
 
-#ifdef __MINGW32__
+#if defined(__MINGW32__) && defined(DEFINE_ADDITIONAL_IPV6_STUFF)
 
 #define	__SOCKADDR_COMMON(sa_prefix) \
   sa_family_t sa_prefix##family
@@ -149,7 +147,7 @@ struct sockaddr_in6
 #define IP6OPT_MUTABLE		0x20
 
 
-#ifdef __MINGW32__
+#if defined(__MINGW32__) && defined(DEFINE_ADDITIONAL_IPV6_STUFF)
 #ifndef EAI_ADDRFAMILY
 struct addrinfo {
 	int	ai_flags;	/* AI_PASSIVE, AI_CANONNAME */

Win32/Src/getaddrinfo.c

@@ -252,6 +252,7 @@ do { \
 #define MATCH(x, y, w) \
 	((x) == (y) || ((w) && ((x) == ANY || (y) == ANY)))
 
+#if  defined(DEFINE_ADDITIONAL_IPV6_STUFF)
 char *
 gai_strerror(ecode)
 	int ecode;
@@ -260,6 +261,7 @@ gai_strerror(ecode)
 		ecode = EAI_MAX;
 	return ai_errlist[ecode];
 }
+#endif
 
 void
 freeaddrinfo(ai)