No debugging symbols or whatever?

Not unless the dll was built for debugging. For example, the first of the missing exports in the OP is _Perl_av_reify referenced in function _da_refgen, and searching perl58.dll for "reify" turns up nothing: 

C:\Perl\bin>strings perl58.dll | find "reify"

[download]
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In reply to Re^4: From whence comes perl-5.8.6-smartmatch.tar? by BrowserUk
in thread From whence comes perl-5.8.6-smartmatch.tar? by BrowserUk

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