Git master head build failure?

[Tim Cross]

Trying to build from current git head (rev:168d2628b23333) and getting
the following error

In toplevel form:
cedet/semantic/bovine/c.el:35:1: Error: Loading file 
/home/tim/git/emacs/lisp/cedet/semantic/bovine/c-by.elc failed to provide 
feature ‘semantic/bovine/c-by’
make[2]: *** [Makefile:279: cedet/semantic/bovine/c.elc] Error 1
make[2]: Leaving directory '/home/tim/git/emacs/lisp'
make[1]: *** [Makefile:302: compile-main] Error 2
make[1]: Leaving directory '/home/tim/git/emacs/lisp'
make: *** [Makefile:398: lisp] Error 2

Tried the following -

git pull
make maintainer-clean
./autogen.sh
./configure
make

also tried make bootstrap.

This is in a repo which previously had the emacs-27 branch checked out.
Now has the master branch checked out.

Is this a known issue or have I missed something?

Platform is Linux (Ubuntu 20.10).

-- 
Tim Cross