In the following testcase, I simply generate an RSA public key and attempt 
to save to a file.  

I have tested this code on windows and it works flawlessly (5.6.1).  
However, I get a compilation error under linux (also version 5.6.1).  I get 
this compilation error whenever I try to use Save or Load function on 
RSAFunction or InvertibleRSAFunction.  

I have inspected the source code and it appears that these functions should 
indeed be inherited from the ASN1CryptoMaterial base class in asn.h, and I 
can't figure out why it won't compile.

----
#include "cryptopp/cryptlib.h"
#include "cryptopp/osrng.h"
#include "cryptopp/modes.h"
#include "cryptopp/integer.h"
#include "cryptopp/base64.h"
#include "cryptopp/rsa.h"
#include "cryptopp/files.h"

int main()
{
    using namespace CryptoPP;

    RSA::PrivateKey privateKey;

    //generate public private keypair...
    AutoSeededRandomPool rng;
    privateKey.GenerateRandomWithKeySize(rng, 2048);
    RSA::PublicKey publicKey(privateKey);    

    // Save as X.509 (using ASN.1 DER Encoding )
    publicKey.Save( FileSink("public.key") );
    //main.cpp:21: error: no matching function for call to 
âCryptoPP::RSAFunction::Save(CryptoPP::FileSink)â

}

//g++ main.cpp -o test -Wfatal-errors -lcryptopp
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