Makefile当中使用alias命令

Unless you've told it otherwise, make isn't using bash, it's using sh. 

 While sh is probably a symlink to bash, when invoked as "sh" it 

doesn't read your .bashrc (nor the system default). You can change 

this behavior with the SHELL variable in your makefile: 

SHELL := /bin/bash 

In general, though, it's better to set everything that you need in the 

makefile, since relying on your aliases makes your makefile highly 

non-portable. I usually do something like (using your example): 

X := y 

and then using $(X) instead of the alias x in commands. 

http://linux.derkeiler.com/Mailing-Lists/Debian/2005-05/0952.html