build failure on emacs25 branch (c45a1ca) on Ubuntu 15.04

[Nils Ackermann]

How do I fix this failure?

make[2]: Entering directory '/scratch/src/emacs/admin/grammars'
  GEN      ../../lisp/cedet/semantic/bovine/c-by.el
Source file ‘/scratch/src/emacs/lisp/international/mule-util.el’ newer than 
byte-compiled file
Source file ‘/scratch/src/emacs/lisp/cedet/semantic/bovine/grammar.el’ newer 
than byte-compiled file
Source file ‘/scratch/src/emacs/lisp/cedet/semantic.el’ newer than 
byte-compiled file
Source file ‘/scratch/src/emacs/lisp/cedet/cedet.el’ newer than byte-compiled 
file
Source file ‘/scratch/src/emacs/lisp/cedet/semantic/tag.el’ newer than 
byte-compiled file
Source file ‘/scratch/src/emacs/lisp/cedet/semantic/fw.el’ newer than 
byte-compiled file
Source file ‘/scratch/src/emacs/lisp/cedet/mode-local.el’ newer than 
byte-compiled file
Source file ‘/scratch/src/emacs/lisp/emacs-lisp/eieio.el’ newer than 
byte-compiled file
Source file ‘/scratch/src/emacs/lisp/emacs-lisp/eieio-core.el’ newer than 
byte-compiled file
Source file ‘/scratch/src/emacs/lisp/emacs-lisp/cl-lib.el’ newer than 
byte-compiled file
Source file ‘/scratch/src/emacs/lisp/emacs-lisp/pcase.el’ newer than 
byte-compiled file
Wrong type argument: number-or-marker-p, #[257 "ÀÁ.DÂ.DE‡" [and symbolp 
eieio--class-v] 5 "

(fn NAME)"]
Makefile:84: recipe for target '../../lisp/cedet/semantic/bovine/c-by.el' failed
make[2]: *** [../../lisp/cedet/semantic/bovine/c-by.el] Error 255
make[2]: Leaving directory '/scratch/src/emacs/admin/grammars'
Makefile:319: recipe for target 'semantic' failed
make[1]: *** [semantic] Error 2
make[1]: Leaving directory '/scratch/src/emacs/lisp'
Makefile:385: recipe for target 'lisp' failed
make: *** [lisp] Error 2

Compilation exited abnormally with code 2 at Fri Mar  4 19:37:36

This is on Ubuntu 15.04.

Thanks,
Nils