Extracted from following patch of gpsbabel:
https://github.com/gpsbabel/gpsbabel/commit/604178aa8ad4d3c3ad218df24c1e9a6a1f683bb3

From 604178aa8ad4d3c3ad218df24c1e9a6a1f683bb3 Mon Sep 17 00:00:00 2001
From: Harel Mazor <harel.mazor@gmail.com>
Date: Tue, 24 Jan 2017 00:35:04 +0200
Subject: [PATCH] Added geojson read capablity, moved magic strings to
 constants, fixed windows compilation issues.

--- a/tef_xml.cc
+++ b/tef_xml.cc
@@ -72,11 +72,11 @@ tef_start(xg_string args, const QXmlStreamAttributes* attrv)
   bool valid = false;
 
   foreach(QXmlStreamAttribute attr, *attrv) {
-    if (attr.name().compare("Comment", Qt::CaseInsensitive) == 0) {
-      if (attr.value().compare("TourExchangeFormat", Qt::CaseInsensitive) == 0) {
+    if (attr.name().compare(QString("Comment"), Qt::CaseInsensitive) == 0) {
+      if (attr.value().compare(QString("TourExchangeFormat"), Qt::CaseInsensitive) == 0) {
         valid = true;
       }
-    } else if (attr.name().compare("Version", Qt::Cas</td></tr></table>
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= 0 &&
+               attr.value().compare(QString("true"), Qt::CaseInsensitive) == 0) {
       wpt_tmp->wpt_flags.fmt_use = 1;  /* only a flag */
 
       /* new in TEF V2 */
-    } else if (attr.name().compare("Instruction", Qt::CaseInsensitive) == 0) {
+    } else if (attr.name().compare(QString("Instruction"), Qt::CaseInsensitive) == 0) {
       wpt_tmp->description = attrstr.trimmed();
-    } else if (attr.name().compare("Altitude", Qt::CaseInsensitive) == 0) {
+    } else if (attr.name().compare(QString("Altitude"), Qt::CaseInsensitive) == 0) {
       wpt_tmp->altitude = attrstr.toDouble();
-    } else if (attr.name().compare("TimeStamp", Qt::CaseInsensitive) == 0) {
+    } else if (attr.name().compare(QString("TimeStamp"), Qt::CaseInsensitive) == 0) {
       /* nothing for the moment */
     }
   }
-- 
2.16.1