Block.h XprType does not refer to a value.

[takzee]

I'm trying to integrate the source code but when I compile I will get a bunch of errors that includes :

/env/card.io-iOS-source/dmz/Eigen/src/Core/Block.h:50:21: error: 'XprType' does not refer to a value error: use of undeclared identifier 'Block'; did you mean 'clock'?

and so on , is it some configuration issues that I'm not doing right or do I need to explicitly installs Eigen?