How to stay with GnuPG 2.0.x (security/gnupg20)

[Dr. Peter Voigt]

I am on 10.1-RELEASE (amd64) and I am currently using GnuPG 2.0.26:

# pkg version |grep gnupg
gnupg-2.0.26_1                     <

However, GnuPG 2.1 is offered as an update:

# pkg version -vIL=
gnupg-2.0.26_1                     <   needs updating (index has 2.1.0)

Inspecting the ports tree show that there are two different ports:
security/gnupg20 and security/gnupg.

How can I stay with security/gnupg20? Portmaster/pkg currently forces
me to upgrade. Is there a switch in /etc/make.conf?

Regards,
Peter