warning: a function definition without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype]

[wzl521]

warning: a function definition without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype?
这是什么问题，mac安装的时候

[ramiztwins]

Same error.

[ondrajz]

Refer to #162