diff --git a/macnet.c b/macnet.c
new file mode 100644
index 00000000..a4b7944b
--- /dev/null
+++ b/macnet.c
@@ -0,0 +1,102 @@
+/* $Id: macnet.c,v 1.1.2.1 1999/04/01 21:26:03 ben Exp $ */
+/*
+ * Copyright (c) 1999 Ben Harris
+ * All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ * 
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
+ * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+/*
+ * macnet.c -- PuTTY-to-MacTCP glue
+ */
+
+#include <MacTypes.h>
+#include <AddresXlation.h>
+#incldue <MacTCP.h>
+#include <MixedMode.h>
+#include <Processes.h>
+
+#include <stdlib.h>
+
+#include "putty.h"
+
+static short mtcp_refnum;
+statis OSErr mtcp_initted = FALSE;
+
+static void macnet_init(void);
+static pascal void macnet_resolved(struct HostInfo *, char *);
+
+#ifdef TARGET_RT_MAC_CFM
+static RoutineDescriptor macnet_resolved_upp =
+    BUILD_ROUTINE_DESCRIPTOR(uppResultProcInfo, (ProcPtr)macnet_resolved);
+#else
+#define macnet_resolved_upp macnet_resolved
+#endif
+
+/*
+ * Initialise networking.  Set mtcp_initted if it goes OK.
+ */
+static OSErr macnet_init(void) {
+    OSErr err;
+
+    err = OpenDriver(".IPP", &mtcp_refnum);
+    if (err != noErr)
+	return err;
+    err = OpenResolver(NULL);
+    if (err != noErr)
+	return err;
+    mtcp_initted = TRUE;
+
+    /* XXX: otherwise report an error */
+}
+
+Socket *tcp_open(const char *host, int port, char **realhost) {
+    ip_addr a;
+    OSError err = noErr;
+    Socket *s;
+
+    s = smalloc(sizeof(struct Socket));
+    if (!mtcp_initted)
+	if ((err = macnet_init()) != noErr)
+	    fatalbox("Couldn't init network (%d)", err);
+    s->port = port;
+    GetCurrentProcess(&s->psn);
+    err = StrToAddr(host, &s->host_info, &macnet_resolved_upp, (char *)s);
+    if (err != noErr)
+	fatalbox("Host lookup failed (%d)", err);
+    if (s->host_info.rtnCode != cacheFault)
+	macnet_resolved(&s->host_info, s);
+    return s;
+}
+
+static pascal void macnet_resolved(struct hostInfo *hi, char *cookie) {
+    Socket *s = (Socket *)cookie;
+
+    /* We should probably tell the process what's going on here. */
+    /* Alternatively, we should kick off the next stage in the process */
+    WakeUpProcess(&s->psn);
+}
+
+/*
+ * Local Variables:
+ * c-file-style: "simon"
+ * End:
+ */ 
diff --git a/macnet.h b/macnet.h
new file mode 100644
index 00000000..74cd6d12
--- /dev/null
+++ b/macnet.h
@@ -0,0 +1,42 @@
+/*
+ * macnet.h -- Mac OS networtking stuff for PuTTY
+ */
+
+#ifndef _PUTTY_MACNET_H
+#define _PUTTY_MACNET_H
+
+#include <MacTypes.h>
+#include <AddressXlation.h>
+#include <MacTCP.h>
+#include <Processes.h>
+
+typedef struct {
+    StreamPtr tcp_stream;
+    struct HostInfo host_info;
+    int port;
+    unsigned char *inbuf;
+    int inbuf_head, inbuf_reap, inbuf_size;
+    unsigned char *outbuf;
+    int outbuf_head, outbuf_reap, outbuf_size;
+    ProcessSerialNumber psn;
+} Socket;
+
+typedef Socket *SOCKET
+
+#define INVALID_SOCKET NULL
+
+#define MSG_OOB 1
+
+extern int send(SOCKET, const void *, size_t, int);
+extern int recv(SOCKET, void *, size_t, int);
+extern SOCKET tcp_open(const char *, int, char **);
+extern void tcp_close(SOCKET);
+extern void tcp_abort(SOCKET);
+
+#endif
+
+/*
+ * Local Variables:
+ * c-file-style: "simon"
+ * End:
+ */
diff --git a/telnet.c b/telnet.c
index bf569b49..26cb9180 100644
--- a/telnet.c
+++ b/telnet.c
@@ -1,4 +1,6 @@
-#ifndef macintosh
+#ifdef macintosh
+#include <mac.h>
+#else /* not macintosh */
 #include <windows.h>
 #include <winsock.h>
 #endif /* not macintosh */