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Another issue is that the development package of libusb has to be installed. On Ubuntu you can do this by using sudo apt-get install libusb-dev.

You may have to restart your PC.

If the ant tasks fails because jni.h is missing edit the build.xml in line 12 from  <condition property="jni.include.dir" value="${java.home}/../include"> to     <condition property="jni.include.dir" value="${java.home}/include">

Furthermore, to use USB connection, a java library has to be compiled via ant. To do this perform cd /path/to/leJOS/build and start ant. If the ant build tool is not installed on your system, you can do so via sudo apt-get install ant.

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