Hi Jan,

Thanks for your reply. I tried several paths for QT5_INSTALL_PATH, no luck so far. After I press configure, I don't see anything that mentions the Qt4 libraries, just entries like Qt5Svg_DIR which are set to e.g. /usr/lib64/cmake/Qt5Svg (/usr/lib64 is a symlink to /lib which in turn is a symlink to /usr/lib). However, for some reason a couple of Qt4 libraries are still being used —

ldd ./OpenFlipper | grep -i "Qt"
    libQt5Declarative.so.5 => /usr/lib/libQt5Declarative.so.5 (0x00007f5f849f9000)
    libQt5OpenGL.so.5 => /usr/lib/libQt5OpenGL.so.5 (0x00007f5f847a1000)
    libQt5Script.so.5 => /usr/lib/libQt5Script.so.5 (0x00007f5f84310000)
    libQt5ScriptTools.so.5 => /usr/lib/libQt5ScriptTools.so.5 (0x00007f5f8403d000)
    libQt5Sql.so.5 => /usr/lib/libQt5Sql.so.5 (0x00007f5f83df6000)
    libQt5Xml.so.5 => /usr/lib/libQt5Xml.so.5 (0x00007f5f83bbb000)
    libQt5XmlPatterns.so.5 => /usr/lib/libQt5XmlPatterns.so.5 (0x00007f5f835d1000)
    libQt5Help.so.5 => /usr/lib/libQt5Help.so.5 (0x00007f5f83335000)
    libQt5WebKit.so.5 => /usr/lib/libQt5WebKit.so.5 (0x00007f5f80ca2000)
    libQt5Network.so.5 => /usr/lib/libQt5Network.so.5 (0x00007f5f80936000)
    libQt5PrintSupport.so.5 => /usr/lib/libQt5PrintSupport.so.5 (0x00007f5f806c5000)
    libQt5Widgets.so.5 => /usr/lib/libQt5Widgets.so.5 (0x00007f5f7fe4b000)
    libQt5X11Extras.so.5 => /usr/lib/libQt5X11Extras.so.5 (0x00007f5f7fc47000)
    libQt5Gui.so.5 => /usr/lib/libQt5Gui.so.5 (0x00007f5f7f4c4000)
    libQt5Core.so.5 => /usr/lib/libQt5Core.so.5 (0x00007f5f7edfa000)

    libQtSvg.so.4 => /usr/lib/libQtSvg.so.4 (0x00007f5f7c167000)
    libQtGui.so.4 => /usr/lib/libQtGui.so.4 (0x00007f5f7b42e000)
    libQtCore.so.4 => /usr/lib/libQtCore.so.4 (0x00007f5f7af26000)

    libQt5CLucene.so.5 => /usr/lib/libQt5CLucene.so.5 (0x00007f5f7ac2c000)
    libQt5Sensors.so.5 => /usr/lib/libQt5Sensors.so.5 (0x00007f5f775eb000)
    libQt5Positioning.so.5 => /usr/lib/libQt5Positioning.so.5 (0x00007f5f773ab000)
    libQt5Quick.so.5 => /usr/lib/libQt5Quick.so.5 (0x00007f5f76dc3000)
    libQt5Qml.so.5 => /usr/lib/libQt5Qml.so.5 (0x00007f5f767d2000)
    libQt5WebChannel.so.5 => /usr/lib/libQt5WebChannel.so.5 (0x00007f5f765b5000)

Note that /usr/lib also contains the Qt5 versions of those libraries (libQt5Svg, libQt5Gui and libQt5Core). Any ideas? I'm probably overlooking something — I don't have a lot of experience manually changing cmake settings.

Best,

Pieter

On 2 May 2016 at 14:01, Jan Möbius <moebius@cs.rwth-aachen.de> wrote:

Hi,

your backtrace states that you are linking against Qt 4 or a mixture of
4/5. Please do the following steps:

Open cmake
Set QT5_INSTALL_PATH to your Qt installation dir( e.g.
.../Qt-5.5.1/5.5/gcc_64 )
Select all other Qt related entries in cmake and remove them.
configure
generate.

You should not see any other qt4 related entries after this. Then rebuild.