x11/libxfce4util with unset option NLS results in GNU gettext tools not found

[Kamil Szczesny]

Hello,

I'm applying devel/poudriere on a 10.1-RELEASE to build packages for my 
desktop.
Important for this is that I have unset the option NLS in my 
corresponding /etc/make.conf.
During package build I noticed the following configure error in 
x11/libxfce4util, which is required by x11-fm/thunar:

checking for xgettext... no
checking for msgmerge... no
checking for msgfmt... no
checking for gmsgfmt... no
configure: error: GNU gettext tools not found; required for intltool
===>  Script "configure" failed unexpectedly.

Is there a clean way to fix this, when NLS is unset?
Currently, I can fix this with
  USES+=	gettext-tools

Any help is appreciated.
Oh, this configure error also happens for example in devel/geany.