Hello,

as topic states, cedet/semantic/util-modes.el uses symbol
'default-header-line-format' (it checks if this symbol is bound by means
of 'boundp') but this symbol was removed in commit '73d47d22197'
(http://git.savannah.gnu.org/cgit/emacs.git/commit/lisp?id=73d47d22197175f08b2dd62e76d7138872e611d2). I
made small patch, tested it and it works well.