Need to be extern C for use by C++.

cpukit/libnetworking/sys/select.h

@@ -37,6 +37,10 @@
 #ifndef _SYS_SELECT_H_
 #define	_SYS_SELECT_H_
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /*
  * Used to maintain information about processes that wish to be
  * notified when I/O becomes possible.
@@ -64,4 +68,8 @@ extern int select (int __nfds, fd_set *__readfds,
                    fd_set *__exceptfds,
                    struct timeval *__timeout);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* !_SYS_SELECT_H_ */