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I agree with kcrisman: don't use sudo. He is referring to the error message "configure: error: You cannot build Sage as root, switch to an unpriviledged user". It also looks like a previous attempt was made trying to build using sudo, so the permissions are now wrong for an unprivileged user to build Sage. Try downloading a fresh tarball to your home directory and building there (not as root, not via sudo).