I think the problem might be in our makefile for the project; from what I can see, you're using latest stable version of Atrinik (3.0), and at the time of its release, the latest version of Python was 3.2, and it's not actually looking for 3.3 at all.
I suggest replacing the following line in CMakeLists.txt:
set(Python_ADDITIONAL_VERSIONS 3.2 3.1 3.0 2.7 2.6)
set(Python_ADDITIONAL_VERSIONS 3.3 3.2 3.1 3.0 2.7 2.6)
rm CMakeCache.txt && cmake . && make
If that doesn't work, try forcing Python 2.7 (which is also compatible with Atrinik IIRC) instead, like this:
set(Python_ADDITIONAL_VERSIONS 2.7 3.2 3.1 3.0 2.6)