I regularly rebuild synfig from source. Each
time I 'make install', it re-links and re-installs
all the modules, whether or not they have
changed. To stop this happening, I modified one
of the automake files.
Here's a patch for automake-1.9.
Here's a patch for automake-1.10.
Now modules are only re-linked and re-installed
when they need to be.
It's kind of ugly to hack automake like this,
but it works for me. There's probably a nice
way to achieve the same effect.