Out of curiosity, what do you get from adding 
print "$_\n" for @Digest::SHA::PurePerl::EXPORT_OK;

[download]

There's nothing conditional in building the subs, so I don't see how sha256 could be missing.

Try changing
eval($fcn);
to
eval("$fcn; 1") or die $@;

In reply to Re: Undefined subroutine on ARM but not i686 by ikegami
in thread Undefined subroutine on ARM but not i686 by cbanker

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