'register' storage class specifier is deprecated and incompatible with C++17
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One file, sfkpack.cpp is using deprecated register keyword which would cause build failure against modern C++ compilers. Suggest to remove it with a simple sed(1) incantation (spaces are to keep existing indentation):
sed -i.bak -e 's/^ *register/ /' sfk-2.0.0/sfkpack.cpp
fixed.