ok, I just spent a short time to read the documentation to build
-current. I made a checkout for the sources and started to build the
toolchain, then I started to build the toolchain and then the
distribution.

it just fails with:

( cd raidctl; printf '.PATH: /usr/src/sbin/raidctl\n.CURDIR:=
/usr/src/sbin/raidctl\n.include "${.CURDIR}/Makefile"\n' |
/server/NetBSD-Build/tools/bin/nbmake -f- CRUNCHEDPROG=1 DBG="-Os"
raidctl.ro )
`raidctl.ro' is up to date.
( cd rcorder; printf '.PATH: /usr/src/bin/rcorder\n.CURDIR:=
/usr/src/bin/rcorder\n.include "${.CURDIR}/Makefile"\n' |
/server/NetBSD-Build/tools/bin/nbmake -f- CRUNCHEDPROG=1 DBG="-Os"
depend )
nbmake: "(stdin)" line 3: Cannot open /usr/src/bin/rcorder/Makefile
nbmake: Fatal errors encountered -- cannot continue

nbmake: stopped in /server/NetBSD-Build/obj/rescue/rcorder

*** Failed target:  rcorder_make
*** Failed command: ( cd rcorder; printf '.PATH:
/usr/src/bin/rcorder\n.CURDIR:= /usr/src/bin/rcorder\n.include
"${.CURDIR}/Makefile"\n' | /server/NetBSD-Build/tools/bin/nbmake -f-
CRUNCHEDPROG=1 DBG="-Os" depend )
*** Error code 1

the source is located at src/sbin/rcorder. Maybe there is a Makefile
wrong?

Uli