Fix in recent commit in nvcc_compiler

theano/sandbox/cuda/nvcc_compiler.py

@@ -139,6 +139,7 @@ class NVCC_compiler(object):
                                         default_to_move_computation_to_gpu=False,
                                         move_shared_float32_to_gpu=False,
                                         enable_cuda=False)
+                n = theano.sandbox.cuda.use.device_number
 
             p = theano.sandbox.cuda.device_properties(n)
             flags.append('-arch=sm_' + str(p['major']) + str(p['minor']))