Receiving "yphelper: Cannot open /etc/gshadow" when running "make -C /var/yp" (NIS)

Issue

When running the command make -C /var/yp the output is as follows:

$ make -C /var/yp/
make: Entering directory `/var/yp'
gmake[1]: Entering directory `/var/yp/STATION11.EXAMPLE.COM'
Updating passwd.byname...
Updating passwd.byuid...
Updating group.byname...
yphelper: Cannot open /etc/gshadow
Updating group.bygid...
yphelper: Cannot open /etc/gshadow
Updating hosts.byname...
Updating hosts.byaddr...
Updating rpc.byname...
Updating rpc.bynumber...
Updating services.byname...
Updating services.byservicename...
Updating netid.byname...
Updating protocols.bynumber...
Updating protocols.byname...
Updating mail.aliases...
Updating shadow.byname...
gmake[1]: Leaving directory `/var/yp/STATION11.EXAMPLE.COM'
make: Leaving directory `/var/yp'