p7zip install

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http://www.linuxquestions.org – I recently installed Slackware 13.1 on Virtualbox 3.2. I downloaded the p7zip Slackbuild and untarred it using tar xvzf. My question is how do I proceed from here? No success with installpkg or pkgtool. I cd to the directory in which the file is located and have tried various things including ./p7zip. I've been reading Slackware Essentials,the forums,and googling but with limited success. (HowTos)