execute command if a dir does not exist

[sharan basappa]

Background : The tool I am using stores its internal information in a 
directory.
The very first time, we are supposed to create this directory using tool's
command. But this is only the first time alone.

Question : How can I write a rule such that a specific command is executed 
if
a directory does not exist under directory from which make is getting 
executed.


Thanks ..

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