# ParaView build is failed while turning on the BUILD\_EXAMPLES

**URL:** https://discourse.paraview.org/t/paraview-build-is-failed-while-turning-on-the-build-examples/76
**Category:** ParaView Support
**Created:** [June 4, 2018, 2:03pm UTC](https://discourse.paraview.org/t/paraview-build-is-failed-while-turning-on-the-build-examples/76 "2018-06-04T14:03:24Z")
**Posts on this page:** 4
**Page:** 1

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### Author: ![hsalimi](https://discourse.paraview.org/user_avatar/discourse.paraview.org/hsalimi/32/41_2.png) [@hsalimi](https://discourse.paraview.org/u/hsalimi)
#### Post date: [June 4, 2018, 2:03pm UTC](https://discourse.paraview.org/t/paraview-build-is-failed-while-turning-on-the-build-examples/76/1 "2018-06-04T14:03:24Z")

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Hi All,

I am building ParaView 5.5 on CentOS 7 using Python 2.7.5 and Qt 5.9.5. While the BUILD\_EXAMPLES option is off, everything is going well, but after turning on this option, I am facing some issues regarding “Qt5::X11Extras”. I have also checked the value of “Qt5X11Extras\_DIR” variable, but it seems to be OK. Here is the build output:

```
[99%] Built target vtkPVStaticPluginsInit
[99%] Build examples as a separate project
Not searching for unused variables given on the command line.
Internal cmake changing into directory: /home/hadi/ParaView/install/Examples/All
Error: cmake execution failed
Configuring
Configuring
Configuring
Configuring
Configuring
Configuring
Configuring
Configuring
Performing Test VTK_UNDEFINED_SYMBOLS_ALLOWED - Success
Found MPI_C: /home/hadi/local/lib/libmpich.so;/home/hadi/local/lib/libopa.so;/home/hadi/local/lib/libmpl.so;/usr/lib64/librt.so;/usr/lib64/libpthread.so 
Found MPI_CXX: /home/hadi/local/lib/libmpichcxx.so;/home/hadi/local/lib/libmpich.so;/home/hadi/local/lib/libopa.so;/home/hadi/local/lib/libmpl.so;/usr/lib64/librt.so;/usr/lib64/libpthread.so 
Configuring
// more repetitions omitted 
Configuring

Configuring done
CMake Error at /home/hadi/ParaView/src/CMake/ParaViewPlugins.cmake:1004 (add_library):
  Target "Autostart" links to target "Qt5::X11Extras" but the target was not
  found. Perhaps a find_package() call is missing for an IMPORTED target, or
  an ALIAS target is missing?
Call Stack (most recent call first):
  Plugins/Autostart/CMakeLists.txt:25 (ADD_PARAVIEW_PLUGIN)

CMake Error at /home/hadi/ParaView/src/CMake/ParaViewPlugins.cmake:1004 (add_library):
  Target "ExampleDockPanel" links to target "Qt5::X11Extras" but the target
  was not found. Perhaps a find_package() call is missing for an IMPORTED
  target, or an ALIAS target is missing?
Call Stack (most recent call first):
  Plugins/DockWidget/CMakeLists.txt:28 (ADD_PARAVIEW_PLUGIN)

CMake Error at /home/hadi/ParaView/src/CMake/ParaViewPlugins.cmake:1004 (add_library):
  Target "GUIMyToolBar" links to target "Qt5::X11Extras" but the target was
  not found. Perhaps a find_package() call is missing for an IMPORTED
  target, or an ALIAS target is missing?
Call Stack (most recent call first):
  Plugins/GUIToolBar/CMakeLists.txt:30 (ADD_PARAVIEW_PLUGIN)

CMake Error at /home/hadi/ParaView/src/CMake/ParaViewPlugins.cmake:1004 (add_library):
  Target "ExamplesPropertyWidgets" links to target "Qt5::X11Extras" but the
  target was not found. Perhaps a find_package() call is missing for an
  IMPORTED target, or an ALIAS target is missing?
Call Stack (most recent call first):
  Plugins/PropertyWidgets/CMakeLists.txt:42 (add_paraview_plugin)

CMake Error at /home/hadi/ParaView/src/CMake/ParaViewPlugins.cmake:1004 (add_library):
  Target "SourceToolbar" links to target "Qt5::X11Extras" but the target was
  not found. Perhaps a find_package() call is missing for an IMPORTED
  target, or an ALIAS target is missing?
Call Stack (most recent call first):
  Plugins/SourceToolbar/CMakeLists.txt:28 (ADD_PARAVIEW_PLUGIN)

CMake Error at /home/hadi/ParaView/src/CMake/pvForwardingExecutable.cmake:91 (add_executable):
  Target "paraview_revised" links to target "Qt5::X11Extras" but the target
  was not found. Perhaps a find_package() call is missing for an IMPORTED
  target, or an ALIAS target is missing?
Call Stack (most recent call first):
  /home/hadi/ParaView/src/CMake/ParaViewBranding.cmake:291 (pv_add_executable_with_forwarding2)
  CustomApplications/Clone1/CMakeLists.txt:45 (build_paraview_client)

CMake Error at /home/hadi/ParaView/src/CMake/pvForwardingExecutable.cmake:91 (add_executable):
  Target "paraview_revised_2" links to target "Qt5::X11Extras" but the target
  was not found. Perhaps a find_package() call is missing for an IMPORTED
  target, or an ALIAS target is missing?
Call Stack (most recent call first):
  /home/hadi/ParaView/src/CMake/ParaViewBranding.cmake:291 (pv_add_executable_with_forwarding2)
  CustomApplications/Clone2/CMakeLists.txt:43 (build_paraview_client)

CMake Error at CustomApplications/Demo0/CMakeLists.txt:20 (add_executable):
  Target "DemoApp0" links to target "Qt5::X11Extras" but the target was not
  found. Perhaps a find_package() call is missing for an IMPORTED target, or
  an ALIAS target is missing?

CMake Error at CustomApplications/Demo1/CMakeLists.txt:33 (add_executable):
  Target "DemoApp1" links to target "Qt5::X11Extras" but the target was not
  found. Perhaps a find_package() call is missing for an IMPORTED target, or
  an ALIAS target is missing?

CMake Error at /home/hadi/ParaView/src/CMake/pvForwardingExecutable.cmake:91 (add_executable):
  Target "multiserverclient" links to target "Qt5::X11Extras" but the target
  was not found. Perhaps a find_package() call is missing for an IMPORTED
  target, or an ALIAS target is missing?
Call Stack (most recent call first):
  /home/hadi/ParaView/src/CMake/ParaViewBranding.cmake:291 (pv_add_executable_with_forwarding2)
  CustomApplications/MultiServerClient/CMakeLists.txt:67 (build_paraview_client)

Generating
Generating
Generating done
Build files have been written to: /home/hadi/ParaView/install/Examples/All

make[2]: *** [ParaViewExamples.done] Error 1
make[1]: *** [CMakeFiles/ParaViewExamples.dir/all] Error 2
make: *** [all] Error 2

```

Any ideas?

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<div class="post-metadata">

### Author: ![mwestphal](https://discourse.paraview.org/user_avatar/discourse.paraview.org/mwestphal/32/17_2.png) [@mwestphal](https://discourse.paraview.org/u/mwestphal)
#### Post date: [June 4, 2018, 2:09pm UTC](https://discourse.paraview.org/t/paraview-build-is-failed-while-turning-on-the-build-examples/76/2 "2018-06-04T14:09:14Z")

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Hi,

Well, what is the value of your `Qt5X11Extras_DIR` ?  
How did you install Qt ?

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<div class="post-metadata">

### Author: ![hsalimi](https://discourse.paraview.org/user_avatar/discourse.paraview.org/hsalimi/32/41_2.png) [@hsalimi](https://discourse.paraview.org/u/hsalimi)
#### Post date: [June 4, 2018, 2:12pm UTC](https://discourse.paraview.org/t/paraview-build-is-failed-while-turning-on-the-build-examples/76/3 "2018-06-04T14:12:58Z")

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I have installed Qt using its online installer script. The value of Qt5X11Extras\_DIR has been extracted by CMake automatically and the value is something like:

~/Qt/5.9.5/gcc\_64/lib/cmake/Qt5X11Extras

Hadi

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<div class="post-metadata">

### Author: ![hsalimi](https://discourse.paraview.org/user_avatar/discourse.paraview.org/hsalimi/32/41_2.png) [@hsalimi](https://discourse.paraview.org/u/hsalimi)
#### Post date: [June 12, 2018, 10:51am UTC](https://discourse.paraview.org/t/paraview-build-is-failed-while-turning-on-the-build-examples/76/4 "2018-06-12T10:51:53Z")

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This problem only happens in compiling with Static libs. With compiling with dynamic libs everything is OK.