Problem installing JRuby using RVM 1.25.13

gistfile1.txt

Last login: Fri Jan  3 08:30:54 on ttys000
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macbeth:~ uwe$ rvm --version

rvm 1.25.13 (master) by Wayne E. Seguin <[email protected]>, Michal Papis <[email protected]> [https://rvm.io/]

macbeth:~ uwe$ rvm install jruby-1.7.8
Searching for binary rubies, this might take some time.
Found remote file http://jruby.org.s3.amazonaws.com/downloads/1.7.8/jruby-bin-1.7.8.tar.gz
Checking requirements for osx.
Requirements installation successful.
jruby-1.7.8 - #configure
jruby-1.7.8 - #download
You don't have permission to create /1.7.8.
There was an error(23).
Checking fallback: ftp://jruby.org.s3.amazonaws.com/downloads/1.7.8/jruby-bin-1.7.8.tar.gz?rvm=1.25.13
Checking fallback: http://www.mirrorservice.org/sites/jruby.org.s3.amazonaws.com/downloads/1.7.8/jruby-bin-1.7.8.tar.gz?rvm=1.25.13
No fallback URL could be found, try increasing timeout with:

    echo "export rvm_max_time_flag=20" >> ~/.rvmrc

Downloading http://jruby.org.s3.amazonaws.com/downloads/1.7.8/jruby-bin-1.7.8.tar.gz failed.
Mounting remote ruby failed, trying to compile.
Checking requirements for osx.
Requirements installation successful.
fatal: Not a git repository (or any of the parent directories): .git
fatal: Not a git repository (or any of the parent directories): .git
fatal: Not a git repository (or any of the parent directories): .git
fatal: Not a git repository (or any of the parent directories): .git
fatal: Not a git repository (or any of the parent directories): .git
Branch origin/master not found.
There has been an error while checking out branch master.  
Halting the installation.
macbeth:~ uwe$