I tried to build.sh several times recently.  It were -j3 builds.  And I get following error:

--- dependall-miscfs ---
--- union.o ---
/flam/var/worksrc/netbsd-current/tools/bin/i686-intel-netbsdelf-ld -r  -o tmp.o lkminit_vfs.o union_vfsops.o union_vnops.o union_subr.o
mv tmp.o union.o
--- dependall ---
--- dependall-ufs ---
--- lfs.o ---
/flam/var/worksrc/netbsd-current/tools/bin/i686-intel-netbsdelf-ld -r  -o tmp.o lkminit_vfs.o lfs_vfsops.o lfs_vnops.o lfs_subr.o lfs_alloc.o lfs_balloc.o lfs_bio.o lfs_cksum.o lfs_debug.o lfs_inode.o lfs_segment.o lfs_syscalls.o ufs_vnops.o
mv tmp.o lfs.o
--- dependall ---
--- dependall ---
--- dependall ---
1 error

nbmake: stopped in /flam/volatile/worksrc/netbsd-current/src/sys

*** Failed target:  dependall-sys
*** Failed command: _makedirtarget() { dir="$1"; shift; target="$1"; shift; case "${dir}" in /*) this="${dir}/"; real="${dir}" ;; .) this=""; real="/flam/volatile/worksrc/netbsd-current/src" ;; *) this="${dir}/"; real="/flam/volatile/worksrc/netbsd-current/src/${dir}" ;; esac; show=${this:-.}; echo "${target} ===> ${show%/}${1:+ (with: $@)}"; cd "${real}" && /flam/var/worksrc/netbsd-current/tools/bin/nbmake _THISDIR_="${this}" "$@" ${target}; }; _makedirtarget sys dependall
*** Error code 2

Stop.
nbmake: stopped in /flam/volatile/worksrc/netbsd-current/src
*** [do-build] Error code 1
1 error

nbmake: stopped in /flam/volatile/worksrc/netbsd-current/src

*** Failed target:  build
*** Failed command: _makedirtarget() { dir="$1"; shift; target="$1"; shift; case "${dir}" in /*) this="${dir}/"; real="${dir}" ;; .) this=""; real="/flam/volatile/worksrc/netbsd-current/src" ;; *) this="${dir}/"; real="/flam/volatile/worksrc/netbsd-current/src/${dir}" ;; esac; show=${this:-.}; echo "${target} ===> ${show%/}${1:+ (with: $@)}"; cd "${real}" && /flam/var/worksrc/netbsd-current/tools/bin/nbmake _THISDIR_="${this}" "$@" ${target}; }; _makedirtarget . do-build
*** Error code 2

Stop.
nbmake: stopped in /flam/volatile/worksrc/netbsd-current/src
*** [distribution] Error code 1
1 error

nbmake: stopped in /flam/volatile/worksrc/netbsd-current/src

ERROR: Failed to make distribution
*** BUILD ABORTED ***