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Ben Boeckel authored
Old versions of `libsigc++` do not have the version macros inside of its `sigc++config.h` header. Assume nothing about such headers and report version "zero". Fixes: #16654
2ab118a8
Old versions of `libsigc++` do not have the version macros inside of its `sigc++config.h` header. Assume nothing about such headers and report version "zero". Fixes: #16654