Dependencies satisfied, build stops anyway.

[bob prohaska]

Attempts to compile a number of ports on RPI2, in this case dns/bind910, often
stop with an error along the lines of: 

/bin/mkdir -p '/tmp/mountpoint.f1jbPw/devel/gettext-tools/work/stage/usr/local/share/gettext'
 install  -m 555 ../build-aux/config.rpath '/tmp/mountpoint.f1jbPw/devel/gettext-tools/work/stage/usr/local/share/gettext'
====> Compressing man pages (compress-man)
===>  Installing for gettext-tools-0.19.8.1
===>  Checking if gettext-tools already installed
===>   gettext-tools-0.19.8.1 is already installed
      You may wish to ``make deinstall'' and install this port again
      by ``make reinstall'' to upgrade it properly.
      If you really wish to overwrite the old port of gettext-tools
      without deleting it first, set the variable "FORCE_PKG_REGISTER"
      in your environment or the "make install" command line.
*** Error code 1

In case it isn't obvious, I'm confused. The version sought is found,
so what's the error? 

Thanks for reading,

bob prohaska