One workaround to get Qt 5 working with SGX is simply forcing just the pvr to 
be loaded by Xorg, creating a specific config:
root@ubuntu-desktop:~# cat /usr/share/X11/xorg.conf.d/99-pvr.conf
# X.Org X server configuration file

Section "Device"
        Identifier      "Video Device"
        Driver          "pvr"
        Option          "FlipChain"     "true"
        Option          "NoAccel"       "false"
EndSection

Section "Monitor"
        Identifier      "Main Screen"
EndSection

Section "Screen"
        Identifier      "Screen"
        Monitor         "Main Screen"
        Device          "Video Device"
EndSection

Section "ServerLayout"
        Identifier      "Server Layout"
        Screen          "Screen"
EndSection

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https://bugs.launchpad.net/bugs/1015292

Title:
  QT5 based applications fails with a segmentation fault with Pandaboard
  and the SGX driver

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