|No such thing as a small change|
Basically, if the Hello.pm shared object exports the say_hello() function, then all works fine. Otherwise you get the failure you reported.
That makes sense to me. If I understand correctly, then the failure mode is very similar to what you get when trying to load a function that a Perl module doesn't export.
The solution would seem to be to recompile Lingua::Stem::Snowball with additional options that specify that its shared object should export the necessary symbols. Fortunately, I maintain Lingua::Stem::Snowball, so I can release a new version if need be.
I've been trying with the gcc -export-dynamic, which I specify using Module::Build's extra_linker_flags option (and verify that it appears on the command line). No luck yet though. Hmm.
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