BIND 9.14.0rc1 fails to install plugins on NetBSD 8

Summary

the make system of BIND 9.14.0rc1 fails to install the plugin "filter-aaaa.so" from the plugins directory. It seems that the Makefile has not been correctly written.

BIND version used

BIND 9.14.0rc1

Steps to reproduce

# ./configure
# gmake
# gmake install

Same happens with BSD "make"

What is the current bug behavior?

Removing /opt/bind/lib/python3.7/site-packages/isc-2.0-py3.7.egg-info
Writing /opt/bind/lib/python3.7/site-packages/isc-2.0-py3.7.egg-info
gmake[2]: Leaving directory '/usr/src/bind-9.14.0rc1/bin/python'
making install in /usr/src/bind-9.14.0rc1/bin/plugins
gmake[2]: Entering directory '/usr/src/bind-9.14.0rc1/bin/plugins'
o filter-aaaa.so \
        filter-aaaa.o 
gmake[2]: o: Command not found
gmake[2]: [Makefile:446: filter-aaaa.so] Error 127 (ignored)
/bin/sh ../../mkinstalldirs /opt/bind/lib
/bin/sh ../../mkinstalldirs /opt/bind/share/man/man8
/usr/bin/install -c -m 644 filter-aaaa.so \
        /opt/bind/lib
install: filter-aaaa.so: stat: No such file or directory
gmake[2]: *** [Makefile:463: install] Error 1
gmake[2]: Leaving directory '/usr/src/bind-9.14.0rc1/bin/plugins'
gmake[1]: *** [Makefile:100: install] Error 1
gmake[1]: Leaving directory '/usr/src/bind-9.14.0rc1/bin'
gmake: *** [Makefile:110: install] Error 1

What is the expected correct behavior?

BIND 9 installing correctly

Relevant configuration files

N/A

Relevant logs and/or screenshots

N/A

Possible fixes

N/A