Building errors with the Matrix Template Library 2 and g++ 4.7

Question

A few years ago I had to use the MTL 2 library in my career's final project (it was a mandatory requirement). I had to work on an existing (and rather old) code and the compiler I used was g++ 4.4.

Now, I want to keep working on that project to try and improve it. I want to use some C++11 features and since Debian Wheezy comes with g++ 4.7, I think I'll use it.

So, I installed MTL 2 and tried to compile the project. But I got an error reagarding ptrdiff_t was not known:

error: expected type-specifier before ‘ptrdiff_t’
error: expected ‘>’ before ‘ptrdiff_t’
error: template argument 4 is invalid

Googleing a bit I found that since g++ 4.6 some things changed in the standard headers and that I needed to include the cstddef header in order to make ptrdiff_t known (a).

So I included that header into the MTL 2 files that used ptrdiff_t and recompiled the project. However, a new error appeared:

In file included from /usr/local/include/mtl/matrix.h:41:0,
             from /usr/local/include/mtl/mtl2lapack.h:20,
             from MCl_Eigen.cpp:36:
/usr/local/include/mtl/envelope2D.h:72:20: error: declaration of ‘typedef struct mtl::twod_tag mtl::envelope2D<T>::dimension’ [-fpermissive]
In file included from /usr/local/include/mtl/matrix_implementation.h:25:0,
             from /usr/local/include/mtl/matrix.h:33,
             from /usr/local/include/mtl/mtl2lapack.h:20,
             from MCl_Eigen.cpp:36:
/usr/local/include/mtl/dimension.h:19:7: error: changes meaning of ‘dimension’ from ‘class mtl::dimension<typename mtl::dense1D<T>::size_type>’ [-fpermissive]
make: *** [MCl_Eigen.o] Error 1

My question is if there's a way to use MTL 2 with the g++ 4.7 compiler or is it better to use a newer version and adapt the code to it? (or use the same compiler as before, g++ 4.4)

(a) I included the cstddef header directly into the MTL files. Should I have done it in the project files instead?