toolchain/50004: postinstall can not fix missing NetBSD.dist.compat

[martin%NetBSD.org@localhost]

>Number:         50004
>Category:       toolchain
>Synopsis:       postinstall can not fix missing NetBSD.dist.compat
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    toolchain-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Jun 27 07:50:00 +0000 2015
>Originator:     Martin Husemann
>Release:        NetBSD 7.99.19
>Organization:
The NetBSD Foundation, Inc.
>Environment:
System: NetBSD night-owl.duskware.de 7.99.19 NetBSD 7.99.19 (NIGHT-OWL) #335: Fri Jun 26 19:48:00 CEST 2015 martin%night-owl.duskware.de@localhost:/usr/src/sys/arch/amd64/compile/NIGHT-OWL amd64
Architecture: x86_64
Machine: amd64
>Description:

After updateing -current from a version w/o etc/mtree/NetBSD.commpat.dist to
a version which has it, postinstall(1) fails:

+ make -s -C /usr/src//etc/mtree 'emit_dist_file'
cat: NetBSD.dist.compat: No such file or directory
+ 'MTREE_DIR=/tmp/_postinstall.17950.0'

and postinstall has no "fix" for the missing file either.

>How-To-Repeat:
see above

>Fix:
Create a "make_compat_distfile" make target and also make the use of 
NetBSD.compat.dist optional in the makefile?