nsICharsetDetector

I am trying to use the chardet functions through xpcom. After
downloading the latest CVS (as of today) and compiling with a mozconfig
of:

mk_add_options MOZ_CO_PROJECT=suite
ac_add_options --enable-application=suite
ac_add_options --disable-optimize
ac_add_options --enable-shared
ac_add_options --enable-debug
ac_add_options --enable-extensions=python/xpcom,universalchardet,cview

the nsICharsetDetector interface does not seem to exist. I cannot
locate the idl file anywhere and when I try to use it, errors are
returned. In addition, cview does not show this interface in its
listings. I can create an instance based on the
@mozilla.org/intl/charsetdetect;1?type=universal_charset_detector
component but the only interface that can be used with this component
seems to be nsISupports.

I am able to list the charset detectors available through the
'@mozilla.org/charset-converter-manager;1' component along with the
nsICharsetConverterManager interface and the GetCharsetDetectorList()
method.

Is there anything special I need to do to get the nsICharsetDetector
interface or am I going at this the wrong way? From the 'view/character
encoding/auto detect/' menu in my mozilla suite compile browser window,
it seems that the charset detection is working correctly. Perhaps there
is another way that I can access these libraries from another program?