以下makefile在执行emacs编译时出错的简单命令时失败。它已通过命令提示符验证。可能是什么问题？
SHELL = cmd.exe
test:
rd /s /q output
make test --debug
GNU Make 3.81
Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.
This program built for i386-pc-mingw32
Reading makefiles...
Updating goal targets....
File `test' does not exist.
Must remake target `test'.
rd /s /q output
The syntax of the command is incorrect.
make: *** [test] Error 1