Makefile:4: *** missing separator. Stop. [solution]

When i tried to compile a program using a Makefile, i had the following error  

Makefile:4: *** missing separator.  Stop.

  after googling the error i found that `make` does not accept whitespaces and unlike DOS, it is expecting a tab in the beginning of each line.

so to solution is to replace the whitespaces ( in this case in the 4th line) with a tab.

reference: http://www.delorie.com/djgpp/v2faq/faq22_17.html