unexpected svn behavior

[Robert Huff]

Hello:
      When I do:

huff@>> cd /usr/src
huff@>> svn up

      I get a clean update.
      However, this script:

#! /bin/sh

# set -x

PATH=/usr/local/bin:/sbin:/usr/sbin:/bin:/usr/bin:/usr/local/sbin

echo Updating kernel+world ...
cd /usr/src
/usr/local/bin/svn up
echo ... done.

      produces:

Updating kernel+world ...
Updating '.':
svn: E230001: Unable to connect to a repository at URL 
'https://svn0.us-east.freebsd.org/base/head'
svn: E230001: Server SSL certificate verification failed: issuer is not 
trusted
.. done.

     and I have to run it manually.
     I know very little about subversion; what's broken, and how do I 
fix it?  (I'll take a pointer to the relevant part of the documentation.)

     Respectfully,


			Robert Huff