expr error in 9-STABLE

[Frank Seltzer]

Posting because I haven't seen this yet. I have been getting this error on 
2 boxes for the last 2 days.

Both boxes:

root at Shop:/usr/src # svn info /usr/src/
Path: .
Working Copy Root Path: /usr/src
URL: svn://kryten.nina.org/src/stable/9
Relative URL: ^/stable/9
Repository Root: svn://kryten.nina.org/src
Repository UUID: ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
Revision: 255501
Node Kind: directory
Schedule: normal
Last Changed Author: mckusick
Last Changed Rev: 255494
Last Changed Date: 2013-09-12 15:36:04 -0400 (Thu, 12 Sep 2013)


===> bin/expr (all)
cc -O2 -pipe  -std=gnu99 -fstack-protector -Wsystem-headers -Werror -Wall 
-Wno-format-y2k -W -Wno-unused-parameter -Wstrict-prototypes 
-Wmissing-prototypes -Wpointer-arith -Wreturn-type -Wcast-qual 
-Wwrite-strings -Wswitch -Wshadow -Wunused-parameter -Wcast-align 
-Wchar-subscripts -Winline -Wnested-externs -Wredundant-decls 
-Wold-style-definition -Wno-pointer-sign -c expr.c
cc1: warnings being treated as errors
expr.c:812: warning: redundant redeclaration of 'yyparse'
/usr/src/bin/expr/expr.y:77: warning: previous declaration of 'yyparse' 
was here
*** [expr.o] Error code 1

Stop in /usr/src/bin/expr.
*** [all] Error code 1

Stop in /usr/src/bin.
*** [bin.all__D] Error code 1

Stop in /usr/src.
*** [everything] Error code 1

Stop in /usr/src.
*** [buildworld] Error code 1

Stop in /usr/src.

Thanks,
Frank