parts/buildout/site.py doesn't honor custom eggs-directory

I define a custom eggs-directory in buildout.cfg, but it isn't honored by the generated script in parts/buildout/site.py (using zc.buildout 1.5.2) when using "relative-paths = true". For example:

    [buildout]
    relative-paths = true
    # Buildout bug: it doesn't honor custom egg dir this in parts/buildout/site.py
    # Until it is fixed we need to use the standard eggs dir.
    eggs-directory = var/eggs

This causes a "ImportError: No module named pkg_resources" because site.py will add the wrong egg dir to sys.path and pkg_resources won't be available. Starting at site.py line 255:

    def addsitepackages(known_paths):
        """Add site packages, as determined by zc.buildout.

        See original_addsitepackages, below, for the original version."""
        join = os.path.join
        base = os.path.dirname(os.path.abspath(os.path.realpath(__file__)))
        base = os.path.dirname(base)
        base = os.path.dirname(base)
        base = os.path.dirname(base)
        setuptools_path = join(base, 'eggs/distribute-0.6.14-py2.6.egg')
        sys.path.append(setuptools_path)
        ]

See? eggs directory is wrong and not honoring the one defined in buildout.cfg.