# What’s new in PyPy 4.0.1

Use pkg-config to find ssl headers on OS-X

The PPC machines now support the _continuation module (stackless, greenlets)

Document that libgdbm-dev is required for translation/packaging

Ensure that ndarray conversion from int16->float16->float32->float16->int16 preserves all int16 values, even across nan conversions. Also fix argmax, argmin for nan comparisons

Support common use-cases for __array_interface__, passes upstream tests

Some refactoring of class handling in the annotator. Remove class specialisation and _settled_ flag.