i386 'make release' broken

Just got the following from a 'make release BUILDNAME=5.1-CURRENT 
CHROOTDIR=/usr/release CVSROOT=/usr/ncvs NOPORTS= NODOC= ".  My
world was up to date to within a day.  The full log is at
http://people.freebsd.org/~scottl/current-release-i386.log.gz.  Note
that while this is an SMP machine, -j was not used.  Also, this
problem did not stop the previous 'buildworld' from completing.
I haven't tried to build a release in a few weeks, so I can't quickly
say when the breakage started.



cc -O -pipe -mcpu=pentiumpro    -Wsystem-headers -Werror -Wall 
-Wno-format-y2k -W -Wstrict-prototypes -Wmissing-prototypes 
-Wpointer-arith -Wreturn-type -Wcast-qual -Wwrite-strings -Wswitch 
-Wshadow -Wcast-align -Wbad-function-cast -Wchar-subscripts -Winline 
-Wnested-externs -Wredundant-decls  -c /usr/src/bin/ed/re.c
/usr/src/bin/ed/re.c: In function `get_compiled_pattern':
/usr/src/bin/ed/re.c:44: warning: declaration of `exp' shadows a global 
declaration
<built-in>:0: warning: shadowed declaration is here
*** Error code 1