While trying to run tahoe-lafs tests, I had errors about writing files in /usr/pkg/lib/python2.6 under Twisted's area. This turns out to be the twisted plugin cache: http://twistedmatrix.com/trac/wiki/FrequentlyAskedQuestions#WhydoIgetaPermissiondeniederrortryingtowrite...site-packagestwistedpluginsdropin.cache.newwhenIusetwistdortrialorsomeotherTwistedprogram It seems that twisted should have a cache regenerator program, and then all twisted plugin packages should run that at install and deinstall time.
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