Can't compile native 64bit

[aapo]

Can't drop -m32 flags.
On 64bit Ubuntu it is possible to compile it for 32bit, but setting multiarch libraries is not smooth enough.

[xLAva]

I'm not sure what your specific issue is. My 64bit Ubuntu 13.04 system can compile everything without a problem for 32bit.
Which libraries are problematic on your system?

A native 64bit version is not on my TODO list right now. This port is just a simple Linux port of the original code.

[aapo]

Ubuntu-12.04 (Long term support version) has issues about installing same time 32bit and 64bit libraries of some development libraries.
E.g *libxext-dev (seems it is fixed on newer versions): https://bugs.launchpad.net/ubuntu/+source/libxext/+bug/997182
*libXrandr-dev
*libXxf86vm-dev

[xLAva]

It's not ideal, but it is possible to install the 32 bit version for compiling and revert back to the 64bit version really fast.
As I sad before: this port is just a simple Linux port. I'm not planing a 64bit version.