c - Required help in make file -

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I just want to apply the statement below 

  "If the bin folder is not currently available If the bin folder is available then its nothing. "  
 Can anyone give me an idea of ​​how I can do this?  
 Edit: I do not have any errors  
  mkdir: directory can not create `./bin` ./bin: file exists   
  -mkdir./bin  
  
 
  
 If  ./bin  already exists, then  mkdir  will fail silently, otherwise it will create a directory.

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