hexagonit.cmmi has directly a prefix parameter.

prefix defaults to {:location}, which means that previous command line was the
ambiguous:
  ./configure --prefix=parts/python [...] --prefix=parts/python2.4


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@32457 20353a03-c40f-0410-a6d1-a30d3c3de9de

buildout/python-2.4/buildout.cfg

@@ -13,12 +13,12 @@ parts =
 recipe = hexagonit.recipe.cmmi
 url =
   http://python.org/ftp/python/${buildout:python_version_full}/Python-${buildout:python_version_full}.tgz
+prefix = ${buildout:directory}/parts/python${buildout:python_version}
 configure-options =
   --enable-unicode=ucs4
   --with-threads
   --with-readline
-  --prefix=${buildout:directory}/parts/python${buildout:python_version}
-executable = ${buildout:directory}/parts/python${buildout:python_version}/bin/python${buildout:python_version}
+executable = ${:prefix}/bin/python${buildout:python_version}
 
 [pythonbin]
 recipe = plone.recipe.command