encoding.c:825:2: error: implicit declaration of function ‘rb_str_change_terminator_length’ is invalid in C99 [-Werror,-Wimplicit-function-declaration] rb_str_change_terminator_length(obj, oldtermlen, termlen)

试图在Big Sur-M1芯片Mac上安装Ruby 2.2.9。

我尝试使用RVM，ASDF …，但是在编译过程中总是会收到此错误：

encoding.c:825:2: error: implicit declaration of function 'rb_str_change_terminator_length' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
    rb_str_change_terminator_length(obj, oldtermlen, termlen);

解决

尝试设置此标志以忽略错误（在安装过程之前）：

export optflags="-Wno-error=implicit-function-declaration"

export optflags =“-Wno-error = implicit-function-declaration” | rvm install 2.5.8