#include <unistd.h>
#include <assert.h>
-#include <sys/socket.h>
-#include <sys/select.h>
+#ifdef HAVE_SYS_SOCKET_H
+# include <sys/socket.h>
+#endif /* def HAVE_SYS_SOCKET_H */
+
+#ifdef HAVE_SYS_SELECT_H
+# include <sys/select.h>
+#endif /* def HAVE_SYS_SELECT_H */
#ifndef WINDOWS
# ifdef __VMS