On arm64, mips64el, mips, mipsel, hppa, alpha, and m68k the standard flags of Theano
for the compiler `-m32` and `-m64` aren't recognized by g++.
To run Theano on this archs, you need to set the configuration flag `config.cxx`
to an empty value for a fall back to the NumPy-based Python execution model.
This could be done either in the scripts by `theano.config.config.cxx`, with the
environment variable `THEANO_FLAGS`, or in your configuration file `$(HOME)/.theanorc`.
See the chapter `config` of the library documentation on the documentation for
details on `config.cxx`.

Daniel Stender <stender@debian.org>