--- MultiPlay.cpp
+++ MultiPlay.cpp
@@ -42,9 +42,9 @@
 typedef int socklen_t;		/* mimic Penguin's typedef */
 
 #else	/* ! WIN32 */
-
+#if !defined closesocket        /* see included ttincl.h */
 #define closesocket(FD) close(FD)
-
+#endif
 #endif
 
 extern long mode;
--- Network.cpp
+++ Network.cpp
@@ -41,9 +41,9 @@
 typedef int socklen_t;		/* mimic Penguin's typedef */
 
 #else	/* ! WIN32 */
-
+#if !defined closesocket        /* see included ttincl.h */
 #define closesocket(FD) close(FD)
-
+#endif
 #endif
 
 bool endian;