How to tell exo where to find "suitable Python interpreter" on FreeBSD?

[Jud]

Downloaded and untar-ed the Thunar and exo tarballs, then running

# ./configure --prefix="/usr/local"

in the exo directory with zsh as shell on FreeBSD -CURRENT results in the following:

checking XFCE_MCS_MANAGER_LIBS... -Wl,--rpath -Wl,/usr/local/lib -L/usr/local/lib -L/usr/X11R6/lib -lxfcegui4 -lxfce4mcs-manager -lxfce4mcs-client -lgtk-x11-2.0 -lgdk-x11-2.0 -lXrandr -lXi -lXinerama -latk-1.0 -lgdk_pixbuf-2.0 -lpangocairo-1.0 -lXcursor -lXfixes -lcairo -lpangoft2-1.0 -lfontconfig -lfreetype -lz -lpango-1.0 -lm -lXrender -lX11 -lXext -lgobject-2.0 -lgmodule-2.0 -lxfce4util -lglib-2.0 -liconv  
configure: Checking to see if we can build Python bindings
checking for a Python interpreter with version >= 2.2... none
configure: error: no suitable Python interpreter found

The python-devel package is installed (Python version 2.5).  

I'm guessing the error results from something pretty elementary, and would much appreciate learning what to do from here, or where to find the relevant information.

Thanks,

Jud