I have checked out the source tree from SVN, and did a build of base. Now I wanted to use the built autogsdoc to generate the source code docs. When invoking it on a sheel I get :
# autogsdoc -DocumentationDirectory ~/doc/GNUStep/base ../Headers/Foundation/NSError.h
autogsdoc: Uncaught exception NSInvalidArgumentException, reason: GSMutableSet(instance) does not recognize removeObjectForKey: