"Mismatched Tags" build failure(s) — clang 3.3

PackageVersionSupposed error messageFull log Bug report
cwidget 0.5.16-3.4../../../src/cwidget/config/keybindings.h:42:5: error: 'key' defined as a struct here but previously declared as a class [-Werror,-Wmismatched-tags] Log
foundry 0.0.20130703-3./tree_bison_tree.hpp:94:1: error: 'node_const_visitor' defined as a class here but previously declared as a struct [-Werror,-Wmismatched-tags] Log
zeromq3 3.2.3+dfsg-2./i_msg_sink.hpp:32:5: error: 'i_msg_sink' defined as a struct here but previously declared as a class [-Werror,-Wmismatched-tags] Log

3 errors