Where is declared the get_defs function please?

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Hello,

I have recently changed my gcc compiler version.

While compiling atkmm-2.22.6 with gcc-5.3.0 I got some errors like:
/tmp/build/software/atkmm-2.22.6/codegen/extradefs/generate_extra_defs_atk.cc:50: undefined reference to 
`get_defs[abi:cxx11](unsigned long, bool (*)(unsigned long))'

I probably need to rebuild a library containing the get_defs function with my new compiler.

Where is declared the get_defs function please?

Thank you.
Best regards.