Arman Mazloumzadeh armanexplorer

## make_variable_check.md

      
        
          
            
              
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                / make_variable_check.md
            
            
              Created
              July 13, 2019 12:10
            
              
                Makefile check if variable is defined
              
          
        
      
        
  
      
    Check if variable is defined in a Makefile

Using ifndef

ifndef MY_FLAG
$(error MY_FLAG is not set)
endif