Error when compiling moc files for newly added classes

[ChrisW67]

Why are you trying to put your class into the Qt Mobility namespace? Did you perhaps intend this:

#ifndef QGEOPOSITIONINFOSOURCELINUX_H
#define QGEOPOSITIONINFOSOURCELINUX_H
#include "qgeopositioninfosource.h"
 
QTM_USE_NAMESPACE
// ^^^^^^^^^^^^^^ this
 
class QGeoPositionInfoSourceLinux : public QGeoPositionInfoSource
{
...
};
 
#endif

#ifndef QGEOPOSITIONINFOSOURCELINUX_H
#define QGEOPOSITIONINFOSOURCELINUX_H
#include "qgeopositioninfosource.h"

QTM_USE_NAMESPACE
// ^^^^^^^^^^^^^^ this

class QGeoPositionInfoSourceLinux : public QGeoPositionInfoSource
{
...
};

#endif

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as described here. Is Qt Mobility enabled in your Pro file?