Unresolved external symbol when using Crypto++ 8.6 as dll

I have to add crypto++ as dll into our project. The project is using 
several functions of crypto++ but a few used give an "unresolved extern 
symbol" linking error:
CryptoPP::DSAConvertSignatureFormat
CryptoPP::Base64Encoder::IsolatedInitialize
CryptoPP::Base64Decoder::GetDecodingLookupArray

Clearly, this can't work because non of those functions have CRYPTOPP_DLL 
set. Is this by intention? Which functions should we call instead?

Best regards,
Ben

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