4.9-release buildworld suddenly stops with NO_SENDMAIL=true

[Eric Veraart]

Hello,

Since I added NO_SENDMAIL=true to  /etc/make.conf make buildworld stops 
with the next two lines:
-------
gzip -cn /usr/src/usr.sbin/boot0cfg/boot0cfg.8 > boot0cfg.8.gz
===> etc
------

If I remember correct it previously stopped on a chmod or something.
I'm not getting any errors or warnings, also nothing in /var/log/messages

Any ideas?

Thanks in advance,
Eric