When trying to check out my latest WordPress plugin on my Mac, I got the following error message:

# svn co http://plugins.svn.wordpress.org/wp-advertize-it wp-advertize-it
svn: E200019: ra_serf was compiled for serf 1.3.4 but loaded an incompatible 1.2.1 library

The reason for this error message is that although there is no separate Serf package in Homebrew anymore and it is included as a private package in SVN and was still on my machine. So I had to remove it:

# brew remove serf
Uninstalling /usr/local/Cellar/serf/1.2.1...

Now of course the library is missing, so SVN still does not work:

# svn co http://plugins.svn.wordpress.org/wp-advertize-it wp-advertize-it
dyld: Library not loaded: /usr/local/lib/libserf-1.0.dylib
  Referenced from: /usr/local/bin/svn
  Reason: image not found
Trace/BPT trap: 5

So you need to uninstall SVN:

# brew uninstall svn
Uninstalling /usr/local/Cellar/subversion/1.8.8...

and reinstall it:

# brew install svn
==> Downloading https://downloads.sf.net/project/machomebrew/Bottles/subversion-1.8.8.mavericks.bottle.1.tar.gz
######################################################################## 100.0%
==> Pouring subversion-1.8.8.mavericks.bottle.1.tar.gz
==> Caveats
svntools have been installed to:
  /usr/local/opt/subversion/libexec

Bash completion has been installed to:
/usr/local/etc/bash_completion.d
==> Summary