我正在听 MIT 操作系统工程讲座。我已经安装了 Qemu 并成功运行了它，我可以在该文件夹中使用这些命令 "make clean" "make" 和 "make qemu" 。Labs 还有一个单独的文件夹...根据说明，我们必须在 labs 文件夹中使用“make”命令，但是当我在 labs 文件夹中使用 make 命令时，我收到以下错误
*** Error: Couldn't find a working QEMU executable.
*** Is the directory containing the qemu binary in your PATH
*** or have you tried setting the QEMU variable in conf/env.mk?
***
***
*** Error: Couldn't find a working QEMU executable.
*** Is the directory containing the qemu binary in your PATH
*** or have you tried setting the QEMU variable in …