Unable to load shared library #39

I'm getting this issue when I try and require('nodegit'):

node.js:201
throw e; // process.nextTick error, or 'error' event on first tick
^
Error: Unable to load shared library /home/dave/git_project/node_modules/nodegit/build/Release/nodegit.node

The file is definitely there, node definitely has permissions to read it. This is on a 64bit Centos 6 box. Only thing I can think is maybe a 64bit/32bit conflict somewhere, maybe libgit2 compiled as 32bit and nodegit compiled as 64bit?

Any ideas welcome!