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a/src/configure.ac b/src/configure.ac
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  # depend on this. We try to detect the qt 4 version string instead.
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  # depend on this. We try to detect the qt 4 version string instead.
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  qmakevers="`${QMAKE} --version 2>&1`"
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  qmakevers="`${QMAKE} --version 2>&1`"
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  #echo "qmake version: $qmakevers"
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  #echo "qmake version: $qmakevers"
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  v4=`expr "$qmakevers" : '.*Qt[ ][ ]*version[ ][ ]*4.*'`
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  v4=`expr "$qmakevers" : '.*Qt[ ][ ]*version[ ][ ]*4.*'`
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  if test X$v4 = X0 ; then 
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  if test X$v4 = X0 ; then 
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     AC_MSG_ERROR([qmake seems to indincate using Qt version 3 which is not supported any more])
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     AC_MSG_ERROR([qmake seems to be using Qt version 3 which is not supported any more])
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     QTGUI=qtgui
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     QTGUI=qtgui
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  else
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  else
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    AC_MSG_NOTICE([using qt version 4 user interface])
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    AC_MSG_NOTICE([using qt version 4 user interface])
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    QTGUI=qtgui
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    QTGUI=qtgui
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  fi
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  fi