mr Hartroth correctly pointed out that poll() isn't really that portable

so we need to hack around it when not there

src/config.h.in

@@ -31,3 +31,7 @@
 
 /* Define if you have the `setvbuf' function. */
 #undef HAVE_SETVBUF
+
+/* Define if you have the `poll' function. */
+#undef HAVE_POLL
+

src/main.c

@@ -1878,8 +1878,26 @@ static int parseconfig(const char *filename,
 
 static void go_sleep(long ms)
 {
+#ifdef HAVE_POLL
   /* portable subsecond "sleep" */
   poll((void *)0, 0, ms);
+#else
+  /* systems without poll() need other solutions */
+
+#ifdef WIN32
+  /* Windows offers a millisecond sleep */
+  Sleep(ms);
+#else
+  /* Other systems must use select() for this */
+  struct timeval timeout;
+
+  timeout.tv_sec = 0;
+  timeout.tv_usec = ms * 1000;
+
+  select(0, NULL,  NULL, NULL, &timeout);
+#endif
+
+#endif
 }
 
 struct OutStruct {