How do install SageMath in Archlinux

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Help me install sage-8.1-Ubuntu_16.04-x86_64.tar.bz2 on Archlinux tar xvf sage-8.1-Ubuntu_16.04-x86_64.tar.bz2 cd SageMath ./sage Then RecursionError: maximum recursion depth exceeded during compilation

It seems that you are attempting to run Sage from an unpacked source tarball, but you have not compiled it yet (or maybe the build has not finished). You should run make in the Sage root directory first. If you did not intend to build Sage from source, you should download a binary tarball instead. Read README.txt for more information.