Tweak the configure logic for ptrdiff_t, which comes from stddef.h on MacOSX, and not malloc.h which doesn't exist on that platform. Fix a couple of typos in configure and platform_defs too.
Tweak the configure logic for ptrdiff_t, which comes from stddef.h
on MacOSX, and not malloc.h which doesn't exist on that platform.
Fix a couple of typos in configure and platform_defs too.