>Is this really a proper check when building RELEASE?  Basically this
>limitation is demanding that the entire tree up to the RELEASE root be
>non-group and non-world writable.

That's sendmail at work, not anything that the NetBSD release is
explicitly doing, though it does seem odd to me that the compilation
runs sendmail -bi.  I suggest that the makefile be ammended to invoke
sendmail -bi with -O
DontBlameSendmail=GroupWritableAliasFile,GroupWritableDirPathSafe

http://www.sendmail.org/tips/DontBlameSendmail.html