build.sh doesn't seem to know which tools directory to use.

Used latest tar files for src_NetBSD-4-0-RC2.

gnusrc.tgz      97795 KB 10/01/07 22:48:00
sharesrc.tgz   6267 KB 10/01/07 22:50:00
src.tgz           45779 KB 10/01/07 22:46:00
syssrc.tgz      33516 KB 10/01/07 22:50:00
xsrc.tgz        97410 KB 10/01/07 22:53:00

Started with a clean /usr/obj directory.
t5048$ cd /usr/src
t5048$ ./build.sh -U -x release    <- built fine, no errors
t5048$ ./build.sh -U kernel=T5048    <- this crapped with the following 
errors
...
...
#    objdir  /usr/obj/tools
===> TOOLDIR path:     /usr/src/obj/tooldir.NetBSD-4.99.31-i386
===> DESTDIR path:     /usr/src/obj/destdir.i386
===> RELEASEDIR path:  /usr/src/obj/releasedir
===> Created /usr/src/obj/tooldir.NetBSD-4.99.31-i386/bin/nbmake
===> makewrapper:      
/usr/src/obj/tooldir.NetBSD-4.99.31-i386/bin/nbmake-i386
===> Updated /usr/src/obj/tooldir.NetBSD-4.99.31-i386/bin/nbmake-i386
===> Building kernel without building new tools
#    objdir  /usr/obj/sys/arch/i386/compile
===> Building kernel:  T5048
===> Build directory:  /usr/src/sys/arch/i386/compile/obj/T5048
rm -f a.out [Ee]rrs mklog core *.core .gdbinit  
./build.sh: /usr/src/obj/tooldir.NetBSD-4.99.31-i386/bin/nbconfig: not found

ERROR: nbconfig failed for T5048
*** BUILD ABORTED ***

Ideas?