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try_compile statements rather than a cuDNN specific variable.

Find cudnn fix

automatic step size reduction code a little.

since sometimes gfortran isn't available and openblas should already be linked
to gfortran if it was needed.

scripts so they attempt to verify the version of cuDNN you have installed and
print a useful message if that isn't the case.

orthogonalize does not work with fixed-sized matrices

detect OS X, and query sysconfig for libdir

minor things.