Install subversion development packages:
sudo yum install --assumeyes subversion-devel
Create a build folder for pysvn and build it:
# Build pysvn from source
mkdir pysvn
cd pysvn
curl http://pysvn.barrys-emacs.org/source_kits/pysvn-1.7.6.tar.gz | tar -xvz
cd pysvn-1.7.6
python setup.py backport # Just incase
python setup.py configure
make
# Optionally test the build
cd ../Tests
make
cd ../Source/
# Install pysvn
sudo mkdir /usr/lib/python2.6/site-packages/pysvn
sudo cp pysvn/_pysvn*.so /usr/lib/python2.6/site-packages/pysvn