Qt5 - Application failure: Could not initialize GLX

RonL

Hello,
I have built Qt5 on my Raspberry PI 2. I have also been successful with building an application that requires Qt5. However the application will only successfully launch when using a directly attached monitor (keyboard, mouse). It fails to launch when attempting to run the application when using a X server running on my PC. The error is : Could not initialize GLX. Let me say I'm really new to all of this and there is probably something very simple I have over looked such as a library I have failed to install. Please take a look at the output of configure.
Please let me know what I need to do so that Qt5 based applications will work on remote X11 server implementations.

Thanks,
Ron
Below is the output of the Qt configure.

Configure summary

Build type: linux-g++ (arm, CPU features: none detected)
Platform notes:

        - Also available for Linux: linux-kcc linux-icc linux-cxx

Build options:
Configuration .......... accessibility accessibility-atspi-bridge alsa audio-backend c++11 clock-gettime clock-monotonic compile_examples concurrent dbus evdev eventfd fontconfig full-config getaddrinfo getifaddrs glib harfbuzz iconv inotify ipv6ifname large-config largefile libudev linuxfb medium-config minimal-config mremap nis opengl openssl pcre png posix_fallocate precompile_header pulseaudio qpa qpa reduce_exports release rpath shared small-config system-freetype system-jpeg system-png system-zlib use_gold_linker xcb xcb-glx xcb-plugin xcb-render xcb-sm xcb-xlib xkbcommon-qt xlib xrender
Build parts ............ libs tools
Mode ................... release
Using C++11 ............ yes
Using gold linker....... yes
Using PCH .............. yes
Target compiler supports:
Neon ................. no

Qt modules and options:
Qt D-Bus ............... yes (loading dbus-1 at runtime)
Qt Concurrent .......... yes
Qt GUI ................. yes
Qt Widgets ............. yes
Large File ............. yes
QML debugging .......... yes
Use system proxies ..... no

Support enabled for:
Accessibility .......... yes
ALSA ................... yes
CUPS ................... no
Evdev .................. yes
FontConfig ............. yes
FreeType ............... yes (system library)
Glib ................... yes
GTK theme .............. no
HarfBuzz ............... yes (bundled copy)
Iconv .................. yes
ICU .................... no
Image formats:
GIF .................. yes (plugin, using bundled copy)
JPEG ................. yes (plugin, using system library)
PNG .................. yes (in QtGui, using system library)
journald ............... no
mtdev .................. no
Networking:
getaddrinfo .......... yes
getifaddrs ........... yes
IPv6 ifname .......... yes
OpenSSL .............. yes (loading libraries at run-time)
NIS .................... yes
OpenGL / OpenVG:
EGL .................. no
OpenGL ............... desktop
OpenVG ............... no
PCRE ................... yes (bundled copy)
pkg-config ............. yes
PulseAudio ............. yes
QPA backends:
DirectFB ............. no
EGLFS ................ no
KMS .................. no
LinuxFB .............. yes
XCB .................. yes (system library)
EGL on X ........... no
GLX ................ yes
MIT-SHM ............ yes
Xcb-Xlib ........... yes
Xcursor ............ yes (loaded at runtime)
Xfixes ............. yes (loaded at runtime)
Xi ................. yes (loaded at runtime)
Xi2 ................ no
Xinerama ........... yes (loaded at runtime)
Xrandr ............. yes (loaded at runtime)
Xrender ............ yes
XKB ................ no
XShape ............. yes
XSync .............. yes
XVideo ............. yes
Session management ..... yes
SQL drivers:
DB2 .................. no
InterBase ............ no
MySQL ................ no
OCI .................. no
ODBC ................. no
PostgreSQL ........... no
SQLite 2 ............. no
SQLite ............... yes (plugin, using bundled copy)
TDS .................. no
udev ................... yes
xkbcommon .............. yes (bundled copy, XKB config root: /usr/share/X11/xkb)
zlib ................... yes (system library)

Qt is now configured for building. Just run 'make'.
Once everything is built, you must run 'make install'.
Qt will be installed into /home/ron/usb1/src/Qt5/qtbase

Prior to reconfiguration, make sure you remove any leftovers from
the previous build.

ron@squireoaksfarm-radio ~/usb1/src/Qt5 $

SGaist

Hi,

Just to be sure I understand you correctly: you are trying to connect your application running on the Pi2 to the X server of your desktop to computer ?

RonL

Hello,
Yes, correct. The application is running on the RPi 2. The X server is running on my PC.
When on the RPI 2 and I issue the command: startx which obviously brings me into the local X11 environment on the RPI 2, the application runs fine. However if and when I am on the PC and start the X11 server on the PC and use that environment to communicate with the RPI 2 the application fails. It does not matter what I use on the PC. TightVNC view, Windows RDP, or MobaXterm.

Thanks for your time,
Ron