diff -urN libssh2-0.18.orig/configure.in libssh2-0.18.mingw/configure.in
--- libssh2-0.18.orig/configure.in	2007-07-31 10:55:29.000000000 +0100
+++ libssh2-0.18.mingw/configure.in	2008-11-10 14:12:07.000000000 +0000
@@ -249,6 +250,7 @@
 AC_CHECK_HEADERS([errno.h fcntl.h stdio.h stdlib.h unistd.h sys/uio.h])
 AC_CHECK_HEADERS([sys/select.h sys/socket.h sys/ioctl.h sys/time.h])
 AC_CHECK_HEADERS([arpa/inet.h netinet/in.h])
+AC_CHECK_HEADERS([windows.h ws2tcpip.h winsock2.h])
 AC_CHECK_FUNCS(poll gettimeofday select)
 
 AC_FUNC_ALLOCA
diff -urN libssh2-0.18.orig/src/libssh2_priv.h libssh2-0.18.mingw/src/libssh2_priv.h
--- libssh2-0.18.orig/src/libssh2_priv.h	2007-08-10 23:30:30.000000000 +0100
+++ libssh2-0.18.mingw/src/libssh2_priv.h	2008-11-10 13:57:49.000000000 +0000
@@ -41,6 +41,14 @@
 #define LIBSSH2_LIBRARY
 #include "libssh2_config.h"
 
+#ifdef HAVE_WINDOWS_H
+#include <windows.h>
+#endif
+
+#ifdef HAVE_WS2TCPIP_H
+#include <ws2tcpip.h>
+#endif
+
 /* The following CPP block should really only be in session.c and
    packet.c.  However, AIX have #define's for 'events' and 'revents'
    and we are using those names in libssh2.h, so we need to include
@@ -70,6 +78,28 @@
 #include "libssh2_publickey.h"
 #include "libssh2_sftp.h"
 
+/* Provide iovec / writev on WIN32 platform. */
+#ifdef WIN32
+
+/* same as WSABUF */
+struct iovec {
+	u_long iov_len;
+	char *iov_base;
+};
+
+#define inline __inline
+
+static inline int writev(int sock, struct iovec *iov, int nvecs)
+{
+	DWORD ret;
+	if (WSASend(sock, (LPWSABUF)iov, nvecs, &ret, 0, NULL, NULL) == 0) {
+		return ret;
+	}
+	return -1;
+}
+
+#endif /* WIN32 */
+
 /* Needed for struct iovec on some platforms */
 #ifdef HAVE_SYS_UIO_H
 #include <sys/uio.h>