Access violation embedding subversion

I'm hoping to embed some of the features of subversion in another
product in Windows by loading the dlls installed with the subversion
command-line client. I've made a few simple things work, but I'm
getting an access violation in a call to svn_client_uuid_from_url. Can
anyone see what I'm doing wrong?

Attached is a little C program that I'm using as a proof of principle.
It does the following:

Loads the libraries libsvn_client-1.dll and libapr-1.dll. These came
with version 1.5.4 of the command-line client.

Gets the addresses of various functions in the libraries.

Gets the subversion client version number (1.5.4).

Creates an apr allocator and then an apr pool.

Creates a subversion context.

Everything works to this point. Then, it calls
svn_client_uuid_from_url, which crashes the program with an access
violation reading location 0x00000008. It looks like
svn_client_uuid_from_url calls svn_client__open_ra_session_internal,
which calls svn_ra_open3. The crash occurs somewhere in svn_ra_open3.

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