[GSAS-II] Trouble insalling GSAS-II

[Kaplan, Benjamin S]

Hello All, 
    I was hoping someone could help me fix my problem installing GSAS-II on my mac.  I get to the point where I run the script bootstrap.py in my terminal, and it starts the installation, but then gives me the following message:

svn: invalid option: --trust-server-cert


I am not sure how to go about fixing this problem or what it even means.  I have attached a picture of what I am seeing when I run it.

Thank you!
    Benjamin Kaplan
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