pango in cairo?

I've used cairo before.
I'm having trouble figuring out how to ues pango.

I've found a whole lot of relatednfile on my system:

/usr/lib/ocaml/cairo/libmlpangocairo.a
/usr/lib/ocaml/cairo/pango_cairo.a
/usr/lib/ocaml/cairo/pango_cairo.cma
/usr/lib/ocaml/cairo/pango_cairo.cmi
/usr/lib/ocaml/cairo/pango_cairo.cmx
/usr/lib/ocaml/cairo/pango_cairo.cmxa
/usr/lib/ocaml/cairo/pango_cairo.mli

and the source code in

 /usr/lib/ocaml/lablgtk2/pango.ml

appears to define a lot of useful names.
I have lots of ways to measure fonts and so forth.
But I can't figure out how to actually draw text on a canvas.

Have I missed something online or on my Debian jessie machine?
Google foind me a decde-old message decryinng the lack of pango support.
And the code I foind suggests that matters are far, far better now.

Where should I be looking for examplees or documentation?

-- hendrik