I tested this one.

Maemo5 have only cairo 1.8.8, but 'cairo >= 1.10' needed. I got it configured (with risk)
configure:
-CAIRO_VERSION=1.10
+CAIRO_VERSION=1.8

And because our cairo aren't compiled with 'tee' (without more knowledge about this)
mozconfig:
-ac_add_options --enable-system-cairo
+ac_add_options --disable-system-cairo

And then I hit on the error:
ipclite/mozilla-central/gfx/skia/src/opts/SkBlitRow_opts_arm.cpp:780: error: fp cannot be used in asm here
(seems this has nothing to do with cairo)

I tested on scratchbox1 and followed 'Build instructions'.