Well, you're looking in the right direction, but none of those symbols should be unresolved -- Perl_sv_bless is bless and so on

I know win32 needs this (apparently no symbols are exported by default) and linux doesn't (apparently everything is exported by default)

So you should check that your Makefile-s are calling makedef.pl and that there exists a embed.fnc that objdump -p perl518.so lists Perl_sv_bless