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    <font face="Arial">Hi:<br>
      <br>
      I've upgraded the qt on my system to version 5.4.1. When trying to
      build subsurface, I get the following error:<br>
      <br>
      linking subsurface<br>
      .obj/qthelper.o: In function `getUserAgent()':<br>
      -------------------------/subsurface/qthelper.cpp:458: undefined
      reference to `SubsurfaceSysInfo::buildCpuArchitecture()'<br>
    </font><font face="Arial"><font face="Arial">-------------------------</font>/subsurface/qthelper.cpp:461:
      undefined reference to
      `SubsurfaceSysInfo::currentCpuArchitecture()'<br>
      .obj/usersurvey.o: In function `UserSurvey::UserSurvey(QWidget*)':<br>
    </font><font face="Arial"><font face="Arial">-------------------------</font>/subsurface/qt-ui/usersurvey.cpp:27:
      undefined reference to `SubsurfaceSysInfo::buildCpuArchitecture()'<br>
    </font><font face="Arial"><font face="Arial">-------------------------</font>/subsurface/qt-ui/usersurvey.cpp:30:
      undefined reference to
      `SubsurfaceSysInfo::currentCpuArchitecture()'<br>
      .obj/usersurvey.o: In function `UserSurvey::getVersion()':<br>
    </font><font face="Arial"><font face="Arial">-------------------------/</font>subsurface/qt-ui/usersurvey.cpp:44:
      undefined reference to `SubsurfaceSysInfo::buildCpuArchitecture()'<br>
    </font><font face="Arial"><font face="Arial">-------------------------/</font>subsurface/qt-ui/usersurvey.cpp:47:
      undefined reference to
      `SubsurfaceSysInfo::currentCpuArchitecture()'<br>
      collect2: error: ld returned 1 exit status<br>
      Makefile:625: recipe for target 'subsurface' failed<br>
      make: *** [subsurface] Error 1<br>
      <br>
      -------------------------------------<br>
      qmake -v<br>
      <br>
      QMake version 3.0<br>
      Using Qt version 5.4.1 in /usr/lib/x86_64-linux-gnu  on Debian/Sid<br>
      <br>
      Any hints?<br>
      <br>
      Cheers:<br>
      <br>
      Pedro<br>
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