# Problem building Helloworld project in Ubuntu: undefined reference to symbol 'XShmGetEventBase' **URL:** \ **Category:** Linux\ **Created:** [January 14, 2017, 2:01pm UTC](https://forum.juce.com/t/problem-building-helloworld-project-in-ubuntu-undefined-reference-to-symbol-xshmgeteventbase/20598 "2017-01-14T14:01:18Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![marquete](https://avatars.discourse-cdn.com/v4/letter/m/f4b2a3/32.png) [@marquete](https://forum.juce.com/u/marquete)\ **Post date:** [January 14, 2017, 2:01pm UTC](https://forum.juce.com/t/problem-building-helloworld-project-in-ubuntu-undefined-reference-to-symbol-xshmgeteventbase/20598/1 "2017-01-14T14:01:18Z")
Hello, I’m new with JUCE and I am having problems trying to build a simple ‘Hello World’ project. I am using Ubuntu 16.04, and as export targets I have: Linux Makefile Code::Blocks (Linux) If i try to build the LinuxMakefile from the command line, it complies just fine. Nevertheless, when trying to build the project using the .cdp file (Code::Blocks) I get the following error: Build log: ``` -------------- Build: Debug in NewProject (compiler: GNU GCC Compiler)--------------- g++ -o bin/Debug/NewProject obj/Debug/Documents/JUCE_Projects/NewProject/JuceLibraryCode/juce_audio_basics.o obj/Debug/Documents/JUCE_Projects/NewProject/JuceLibraryCode/juce_audio_devices.o obj/Debug/Documents/JUCE_Projects/NewProject/JuceLibraryCode/juce_audio_formats.o obj/Debug/Documents/JUCE_Projects/NewProject/JuceLibraryCode/juce_audio_processors.o obj/Debug/Documents/JUCE_Projects/NewProject/JuceLibraryCode/juce_core.o obj/Debug/Documents/JUCE_Projects/NewProject/JuceLibraryCode/juce_cryptography.o obj/Debug/Documents/JUCE_Projects/NewProject/JuceLibraryCode/juce_data_structures.o obj/Debug/Documents/JUCE_Projects/NewProject/JuceLibraryCode/juce_events.o obj/Debug/Documents/JUCE_Projects/NewProject/JuceLibraryCode/juce_graphics.o obj/Debug/Documents/JUCE_Projects/NewProject/JuceLibraryCode/juce_gui_basics.o obj/Debug/Documents/JUCE_Projects/NewProject/JuceLibraryCode/juce_gui_extra.o obj/Debug/Documents/JUCE_Projects/NewProject/JuceLibraryCode/juce_opengl.o obj/Debug/Documents/JUCE_Projects/NewProject/JuceLibraryCode/juce_video.o obj/Debug/Documents/JUCE_Projects/NewProject/Source/Main.o obj/Debug/Documents/JUCE_Projects/NewProject/Source/MainComponent.o -lGL -ldl -lpthread -lrt /usr/bin/ld: obj/Debug/Documents/JUCE_Projects/NewProject/JuceLibraryCode/juce_gui_basics.o: undefined reference to symbol 'XShmGetEventBase' //usr/lib/x86_64-linux-gnu/libXext.so.6: error adding symbols: DSO missing from command line collect2: error: ld returned 1 exit status Process terminated with status 1 (0 minute(s), 0 second(s)) 1 error(s), 0 warning(s) (0 minute(s), 0 second(s)) ``` Build messages: ``` ||=== Build: Debug in NewProject (compiler: GNU GCC Compiler) ===| /usr/bin/ld: obj/Debug/Documents/JUCE_Projects/NewProject/JuceLibraryCode/juce_gui_basics.o||undefined reference to symbol 'XShmGetEventBase'| ||=== Build failed: 1 error(s), 0 warning(s) (0 minute(s), 0 second(s)) ===| ``` I already checked if i have installed libxext-dev, and I did, I also tried re-saving the projects from JUCE (as another post mentioned: [[Linux linking errors on Ubuntu Mate](https://forum.juce.com/t/linux-linking-errors-on-ubuntu-mate/18794)] ) I just want to be able to run, compile and debug from an IDE in ubuntu, Thanks in advance for your help. Best regards, Marco ---
**Author:** ![t0m](https://sea2.discourse-cdn.com/flex026/user_avatar/forum.juce.com/t0m/32/16413_2.png) [@t0m](https://forum.juce.com/u/t0m)\ **Post date:** [January 16, 2017, 9:22am UTC](https://forum.juce.com/t/problem-building-helloworld-project-in-ubuntu-undefined-reference-to-symbol-xshmgeteventbase/20598/2 "2017-01-16T09:22:33Z")
Are you using the latest version of the Projucer, compiled from the tip of the develop branch? We’ve recently fixed a few things in the Code::Blocks exporter which haven’t yet made it to the master branch.