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::CaseInsensitive) == 0) {
+    } else if (attr.name().compare(QString("Version"), Qt::CaseInsensitive) == 0) {
       version = attr.value().toString().toDouble();
     }
   }
@@ -95,9 +95,9 @@ tef_header(xg_string args, const QXmlStreamAttributes* attrv)
 {
   route = route_head_alloc();
   foreach(QXmlStreamAttribute attr, *attrv) {
-    if (attr.name().compare("Name", Qt::CaseInsensitive) == 0) {
+    if (attr.name().compare(QString("Name"), Qt::CaseInsensitive) == 0) {
       route->rte_name = attr.value().toString().trimmed();
-    } else if (attr.name().compare("Software", Qt::CaseInsensitive) == 0) {
+    } else if (attr.name().compare(QString("Software"), Qt::CaseInsensitive) == 0) {
       route->rte_desc = attr.value().toString().trimmed();
     }
   }
@@ -248,20 +248,20 @@ tef_item_start(xg_string args, const QXmlStreamAttributes* attrv)
     QString attrstr = attr.value().toString();
     QByteArray attrtext = attrstr.toUtf8();
 
-    if (attr.name().compare("SegDescription", Qt::CaseInsensitive) == 0) {
+    if (attr.name().compare(QString("SegDescription"), Qt::CaseInsensitive) == 0) {
       wpt_tmp->shortname = attrstr.trimmed();
-    } else if (attr.name().compare("PointDescription", Qt::CaseInsensitive) == 0) {
+    } else if (attr.name().compare(QString("PointDescription"), Qt::CaseInsensitive) == 0) {
       wpt_tmp->description = attrstr.trimmed();
-    } else if (attr.name().compare("ViaStation", Qt::CaseInsensitive) == 0 &&
-               attr.value().compare("true", Qt::CaseInsensitive) == 0) {
+    } else if (attr.name().compare(QString("ViaStation"), Qt::CaseInsensitive) == 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

oadFile(path.c_str());
     if (document.Error())
     {
-        const char* errorStr1 = document.GetErrorStr1();
-        const char* errorStr2 = document.GetErrorStr2();
+        const char* errorStr = document.ErrorStr();
         std::string errorString(&quot;Error was &quot;);
-        if (errorStr1)
-        {
-            errorString += errorStr1;
-        }
-        if (errorStr2)
-        {
-            errorString += errorStr2;
-        }
-        if (!errorStr1 &amp;&amp; !errorStr2)
-        {
+        if (errorStr)
+            errorString += errorStr;
+        else
             errorString += &quot;not specified.&quot;;
-        }
         GMX_THROW(TestException(&quot;Reference data not parsed successfully: &quot; + path + &quot;\n.&quot;
                                 + errorString + &quot;\n&quot;));
     }
@@ -371,7 +362,7 @@ void writeReferenceDataFile(const std::string&amp; path, const ReferenceDataEntry&amp; r
     XMLElementPtr rootElement = createRootElement(&amp;document);
     createChildElements(rootElement, rootEntry);
 
-    if (document.SaveFile(path.c_str()) != tinyxml2::XML_NO_ERROR)
+    if (document.SaveFile(path.c_str()) != tinyxml2::XML_SUCCESS)
     {
         GMX_THROW(TestException(&quot;Reference data saving failed in &quot; + path));
     }
</pre>
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