py-geoip fails to build

[benjamin.winston@…]

upon port install py-geoip, I get:

dorothy:nproxy benjaminwinston$ sudo port install py-geoip
--->  Fetching py-geoip
--->  Verifying checksum(s) for py-geoip
--->  Extracting py-geoip
--->  Configuring py-geoip
--->  Building py-geoip
Error: Target org.macports.build returned: shell command " cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_python_py-geoip/work/GeoIP-Python-1.2.0" && /opt/local/bin/python2.4 setup.py build " returned error 1
Command output: Traceback (most recent call last):
  File "setup.py", line 12, in ?
    ext_modules = [module1])
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/distutils/core.py", line 123, in setup
    dist.parse_config_files()
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/distutils/dist.py", line 339, in parse_config_files
    filenames = self.find_config_files()
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/distutils/dist.py", line 302, in find_config_files
    check_environ()
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/distutils/util.py", line 209, in check_environ
    os.environ['PLAT'] = get_platform()
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/distutils/util.py", line 78, in get_platform
    cfgvars = get_config_vars()
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/distutils/sysconfig.py", line 488, in get_config_vars
    func()
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/distutils/sysconfig.py", line 373, in _init_posix
    raise DistutilsPlatformError(my_msg)
distutils.errors.DistutilsPlatformError: $MACOSX_DEPLOYMENT_TARGET mismatch: now "10.5" but "" during configure

Error: Status 1 encountered during processing.
dorothy:nproxy benjaminwinston$