FreeBSD web build failed on build-web.ysv.freebsd.org

Tue Sep 19 14:39:02 UTC 2017

Sep 19 14:37:02 build-web newsyslog[86664]: logfile turned over due to -F request
Build started Tue Sep 19 14:39:00 UTC 2017
Updating 'head':
At revision 50882.
Updating 'relnotes/doc':
At revision 323762.
Updating 'relnotes/man4':
At revision 323762.
Updating 'relnotes11/doc':
At revision 323762.
Updating 'relnotes11/man4':
At revision 323762.
Updating 'relnotes10/doc':
At revision 323762.
Updating 'relnotes10/man4':
At revision 323762.
Updating 'ports':
At revision 450129.
make -V SUBDIR | sed -E 's/[ ]+$//' | tr " " "\n" | sed -E 's/^/make -C /' | tr '\n' '\0' | xargs -0 -n1 -P /bin/sh -c
xargs: -P /bin/sh: invalid
*** Error code 1

Stop.
make: stopped in /usr/local/www/build/head
        0.04 real         0.01 user         0.03 sys