How to Download and Compile Libpri
In order to download the source, visit http://www.downloads.digium.com/pub/telephony/libpri/ and select one of the tar.gz links (http://downloads.asterisk.org/pub/telephony/http://downloads.asterisk.org/pub/telephony/libpri/libpri-1.4.14.tar.gz for example)
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In a terminal, change to the /usr/src directory then download the libpri tarball (copied .tar.gz link)
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After this is done, extract the file
tar -zxvf libpri-1.4.14.tar.gz
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Change to the dahdi directory
cd libpri-1.4.14/
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Lastly, compile Libpri
make
make install