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examples/parse_args.h: only use jack where need be

--- a/examples/parse_args.h

+++ b/examples/parse_args.h

@@ -215,6 +215,7 @@

   // if no source, show a message

   if (source_uri == NULL) {

+#ifdef PROG_HAS_JACK

 #if HAVE_JACK

     verbmsg("No input source given, using jack\n");

     usejack = 1;

@@ -221,7 +222,11 @@

 #else

     errmsg("Error: no arguments given (and no available audio input)\n");

     usage ( stderr, 1 );

-#endif

+#endif /* HAVE_JACK */

+#else

+    errmsg("Error: no arguments given\n");

+    usage ( stderr, 1 );

+#endif /* PROG_HAS_JACK */

   }

   return 0;