Here is a patch which silences the error message. Probably not the best approach, but it works for me. :) With this I could convert my GPX tracks which didn't have <speed> elements.
Cheers,
Rodney
--- src/setpath.c.orig 2005-02-06 09:58:47.000000000 -0500
+++ src/setpath.c 2008-10-25 07:08:25.000000000 -0400
@@ -422,7 +422,7 @@
countUnconverted(pdata);
return 0;
/* check path speed */
- } else if (pattr->speed == .0) {
+ } else if (0 && pattr->speed == .0) {
fprintf
(stderr,
"gpx2shp:%s:%i track was not converted because no move
recorded.\n",
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