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Compiling taglib with QT on Ubuntu

Programming - Oct 7 2015
not answered
Question:Sorry for the newbie factor..
I can't get taglib working in my QT environment.
I have installed the 1.9.1 library with "sudo apt-get install libtag1-dev".

When i compile my program i get a error..

../MP3_Tagger/mainwindow.cpp:158: error: undefined reference to `TagLib::FileRef::FileRef(char const*, bool, TagLib::AudioProperties::ReadStyle)'

../MP3_Tagger/mainwindow.cpp:158: error: undefined reference to `TagLib::FileRef::~FileRef()'

../MP3_Tagger/mainwindow.cpp:158: error: undefined reference to `TagLib::FileRef::~FileRef()'

:-1: error: collect2: error: ld returned 1 exit status

My .pro file contains the INCLUDE PATH to the Library and a LIBS pad with -ltag.
The header of my mainwindow.h & mainwindow.cpp file contains different includes for taglib..
This is the code i try to compile in my mainwindow.cpp file..

QByteArray file = QFile::encodeName(FileName);
const char * encodedName = file.constData();
//TagLib::FileRef fileref = TagLib::FileRef f(encodedName, true, TagLib::AudioProperties::Average);
TagLib::FileName fn(FileName.toStdString().c_str());
TagLib::FileRef nfr(fn);
//TagLib::FileRef (fn, true, TagLib::AudioProperties::Average);

You can see that i try different things... but always the same result.
I even try to add the liberary in a differende way (manualy installation) but any difference.
In the install manual of taglib, i see a explanation for Mac OS X and Windows but notting for Ubuntu or Linux.

Can sombody help me out or give me some direction?
I am googling now for several day's and can't get it right.

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