Internal command not found in dos command line

[Ethan Du]

Hi:
 
    I have a makefile like this:
... ...
clean:
 echo "ethan from space"

    When run "make clean" (GNU Make 3.81.2, built in cygwin) from a separate folder which only have make.exe and 3 dlls (cygiconv-2.dll, cygintl-8.dll, cygwin1.dll) from dos command line, I met the following:
make: echo: Command not found
make: *** [clean] Error 127
 
    With a little change in the makefile:
... ...
clean:
 cmd /c echo "ethan from space"

    It works. So, my question is: are the internal commands must be called with "cmd /c"? or what else is wrong?
 
Thanks,
Ethan
   

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