- sudo apt-get install proj
- GDAL no longer seems necessary for PCL-Core
- Install geos 2.2.3 from source (Note to self: apparently libs for extension modules must be installed under the same prefix as Python; e.g., if Python is under /usr/lib, you can’t install geos into /usr/local/lib.)
- Check out the PCL trunk:
cd ~/src && svn co http://svn.gispython.org/gispy/PCL/trunk PCL
- cd PCL/PCL-Core
- sudo setup.py install

OK, so that last step really only worked after I modified setup.py in PCL-Core like so:

from distutils.core import setup, Extension
### Added extensions
proj4_extension = Extension(
'cartography.proj.transform._proj4',
sources=['cartography/proj/transform/_proj4module.c'],
libraries=['proj'],
include_dirs=[]
)

geom_extension = Extension(
'cartography.geometry._geom',
sources=['cartography/geometry/_geommodule.c'],
libraries=['geos_c', 'proj']
)
### End

# ---------------------------------------------------------------------------
# Execute setup
# ---------------------------------------------------------------------------
setup(
name          = 'Python Cartographic Library',
version       = '0.11.0',
description   = 'Library for rendering maps from GIS data',
author          = 'Sean Gillies',
author_email  = 'sgillies@frii.com',
url           = 'http://zmapserver.sourceforge.net/',
packages      = ['cartography',
### Added  stuff below here
'cartography.geometry',
'cartography.proj',
'cartography.proj.transform',
],
ext_modules   = [proj4_extension,
geom_extension,
],
)

Actually, I don’t know if this really works. I just did the “smoke test” of `python -c ‘import cartography.geometry’`. [Update: It does work.]