fc-list :lang=en does not show any font on my system with current fontconfig cvs head. We have got related bug reports for epiphany, so I guess it's not only a local problem. It works with fccfg.c 1.35, but it doesnt with fccfg.c 1.36.
This is a symptom of the whole language matching stuff being broken; I posted a longish message a couple of days ago about what I was going to do to fix it. Now to find the time to fix the code...
'en' contains 'en-GB' and 'en-GB' contains 'en' now.
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