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[param98 <>]

I did do two installations of Qt but neither was a Qt4 installation. 
I ensured that QGL viewer was compiled with Qt 5.6.2.
I don't know how to check if demo is being built with Qt 5.6.2 or not.
Here is the output from ldd Polyhedron_3:

$ldd Polyhedron_3
linux-vdso.so.1 =>  (0x00007ffdd4d96000)
        libCGAL_Qt5.so.11 => /usr/lib/x86_64-linux-gnu/libCGAL_Qt5.so.11
(0x00007fea100dc000)
        libdemo_framework.so =>
/home/param/Libs/demos/demo/Polyhedron/libdemo_framework.so
(0x00007fea0fea6000)
        libpoint_dialog.so =>
/home/param/Libs/demos/demo/Polyhedron/libpoint_dialog.so
(0x00007fea0fc9d000)
        libQGLViewer-qt5.so.2 => /usr/local/lib/libQGLViewer-qt5.so.2
(0x00007fea0f9ec000)
        libQt5OpenGL.so.5 => /home/param/anaconda3/lib/libQt5OpenGL.so.5
(0x00007fea0f795000)
        libQt5Widgets.so.5 => /home/param/anaconda3/lib/libQt5Widgets.so.5
(0x00007fea0ef69000)
        libQt5Gui.so.5 => /home/param/anaconda3/lib/libQt5Gui.so.5
(0x00007fea0e79d000)
        libQt5Script.so.5 => /home/param/anaconda3/lib/libQt5Script.so.5
(0x00007fea0e311000)
        libQt5Core.so.5 => /home/param/anaconda3/lib/libQt5Core.so.5
(0x00007fea0dbef000)
        libstdc++.so.6 => /home/param/anaconda3/lib/libstdc++.so.6
(0x00007fea0d8b5000)
        libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007fea0d5ac000)
        libgcc_s.so.1 => /home/param/anaconda3/lib/libgcc_s.so.1
(0x00007fea0d39a000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007fea0cfd0000)
        libQt5Svg.so.5 => /home/param/anaconda3/lib/libQt5Svg.so.5
(0x00007fea0cd7d000)
        libGL.so.1 => /usr/lib/x86_64-linux-gnu/mesa/libGL.so.1
(0x00007fea0cb0a000)
        libgl_splat.so => 
/home/param/Libs/demos/demo/Polyhedron/libgl_splat.so
(0x00007fea0c8fe000)
        libGLU.so.1 => /usr/lib/x86_64-linux-gnu/libGLU.so.1 
(0x00007fea0c68f000)
        libQt5Xml.so.5 => /home/param/anaconda3/lib/libQt5Xml.so.5
(0x00007fea0c452000)
        libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0
(0x00007fea0c235000)
        libpng16.so.16 => /home/param/anaconda3/lib/./libpng16.so.16
(0x00007fea0bffe000)
        libz.so.1 => /home/param/anaconda3/lib/./libz.so.1 
(0x00007fea0bde7000)
        libicui18n.so.58 => /home/param/anaconda3/lib/./libicui18n.so.58
(0x00007fea0b972000)
        libicuuc.so.58 => /home/param/anaconda3/lib/./libicuuc.so.58
(0x00007fea0b5c4000)
        libicudata.so.58 => /home/param/anaconda3/lib/./libicudata.so.58
(0x00007fea09ac4000)
        libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007fea098c0000)
        libgthread-2.0.so.0 => /home/param/anaconda3/lib/./libgthread-2.0.so.0
(0x00007fea096be000)
        librt.so.1 => /lib/x86_64-linux-gnu/librt.so.1 (0x00007fea094b6000)
        libglib-2.0.so.0 => /home/param/anaconda3/lib/./libglib-2.0.so.0
(0x00007fea091a3000)
        /lib64/ld-linux-x86-64.so.2 (0x00007fea10316000)
        libexpat.so.1 => /home/param/anaconda3/lib/libexpat.so.1
(0x00007fea08f70000)
        libxcb-dri3.so.0 => /home/param/anaconda3/lib/libxcb-dri3.so.0
(0x00007fea08d6d000)
        libxcb-present.so.0 => /home/param/anaconda3/lib/libxcb-present.so.0
(0x00007fea08b6a000)
        libxcb-sync.so.1 => /home/param/anaconda3/lib/libxcb-sync.so.1
(0x00007fea08963000)
        libxshmfence.so.1 => /usr/lib/x86_64-linux-gnu/libxshmfence.so.1
(0x00007fea08760000)
        libglapi.so.0 => /usr/lib/x86_64-linux-gnu/libglapi.so.0
(0x00007fea08530000)
        libXext.so.6 => /usr/lib/x86_64-linux-gnu/libXext.so.6 
(0x00007fea0831e000)
        libXdamage.so.1 => /usr/lib/x86_64-linux-gnu/libXdamage.so.1
(0x00007fea0811b000)
        libXfixes.so.3 => /usr/lib/x86_64-linux-gnu/libXfixes.so.3
(0x00007fea07f15000)
        libX11-xcb.so.1 => /usr/lib/x86_64-linux-gnu/libX11-xcb.so.1
(0x00007fea07d13000)
        libX11.so.6 => /usr/lib/x86_64-linux-gnu/libX11.so.6 
(0x00007fea079d9000)
        libxcb-glx.so.0 => /home/param/anaconda3/lib/libxcb-glx.so.0
(0x00007fea077bd000)
        libxcb-dri2.so.0 => /home/param/anaconda3/lib/libxcb-dri2.so.0
(0x00007fea075b8000)
        libxcb.so.1 => /home/param/anaconda3/lib/libxcb.so.1 
(0x00007fea0738f000)
        libXxf86vm.so.1 => /usr/lib/x86_64-linux-gnu/libXxf86vm.so.1
(0x00007fea07189000)
        libdrm.so.2 => /usr/lib/x86_64-linux-gnu/libdrm.so.2 
(0x00007fea06f78000)
        libpcre.so.1 => /home/param/anaconda3/lib/././libpcre.so.1
(0x00007fea06d33000)
        libXau.so.6 => /usr/lib/x86_64-linux-gnu/libXau.so.6 
(0x00007fea06b2f000)





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