world build stuck in gnu for about a week for me.

I build world several times a week on this machine:
9.0-CURRENT FreeBSD 9.0-CURRENT #126: Mon Nov  8 07:22:49 CST 2010

Since the above build I have not been able to get past gnu.

Today it broke at gdb :


===> gnu/usr.bin/dialog (cleandir)
===> gnu/usr.bin/dialog/TESTS (cleandir)
===> gnu/usr.bin/diff (cleandir)
===> gnu/usr.bin/diff/doc (cleandir)
rm -f diff.info diff.info.gz
===> gnu/usr.bin/diff3 (cleandir)
===> gnu/usr.bin/gdb (cleandir)
===> gnu/usr.bin/gdb/doc (cleandir)
===> gnu/usr.bin/gdb/libgdb (cleandir)
Unclosed substitution for TARGET_ARCH (/ missing)
*** Error code 2

Stop in /usr/src/gnu/usr.bin/gdb.
*** Error code 1

Stop in /usr/src/gnu/usr.bin.
*** Error code 1

Stop in /usr/src/gnu.
*** Error code 1

Stop in /usr/src.
*** Error code 1

Stop in /usr/src.
*** Error code 1

My main concern is if it is my error or a known problem that I have  
missed.  I regularly do make check-old and delete-old.

Thanks for confirming,

ed

P.S. This isn't a problem but a concern.