Upgrade of mail/thunderbird fails with installed security/gnupg20

[Dr. Peter Voigt]

The latest upgrade of mail/thunderbird fails because it does not accept
installed security/gnupg20 but insists on an installed security/gnupg.

gmake[4]: Entering directory
'/usr/ports/security/gnupg/work/gnupg-2.1.0' gmake[4]: Nothing to be
done for 'install-data-hook'. gmake[4]: Leaving directory
'/usr/ports/security/gnupg/work/gnupg-2.1.0' gmake[3]: Leaving
directory '/usr/ports/security/gnupg/work/gnupg-2.1.0' gmake[2]:
Leaving directory '/usr/ports/security/gnupg/work/gnupg-2.1.0'
gmake[1]: Leaving directory
'/usr/ports/security/gnupg/work/gnupg-2.1.0' ====> Compressing man
pages (compress-man) ===>>> Starting check for runtime dependencies
===>>> Gathering dependency list for security/gnupg from ports ===>>>
Dependency check complete for security/gnupg

===>>> mail/thunderbird >> security/gnupg (1/1)

===>  Installing for gnupg-2.1.0_1
===>  Checking if gnupg already installed
===>   Registering installation for gnupg-2.1.0_1 as automatic
pkg-static: gnupg-2.1.0_1 conflicts with gnupg20-2.0.26_2 (installs
files into the same place).  Problematic file: /usr/local/bin/gpg-agent
###############################################################################
A T T E N T I O N

In order to use gpg-agent, you need to install a pinentry dialog.

The following ports of pinentry dialogs are available:

security/pinentry-curses        (ncurses based dialog)
security/pinentry-gtk           (GTK 1.2 based dialog)
security/pinentry-gtk2          (GTK 2.x based dialog)
security/pinentry-qt            (QT3 based dialog)
security/pinentry-q4            (QT4 based dialog)

###############################################################################

*** Error code 70

Stop.
make: stopped in /usr/ports/security/gnupg

===>>> Installation of gnupg-2.1.0_1 (security/gnupg) failed
===>>> Aborting update

===>>> Update for security/gnupg failed
===>>> Aborting update


===>>> You can restart from the point of failure with this command line:
       portmaster <flags> mail/thunderbird security/gnupg

# pkg version |grep -i gnupg
gnupg20-2.0.26_2     =

# uname -s -r -m   
FreeBSD 10.1-RELEASE amd64

Regards,
Peter