Eclipse CDT: no rule to make target all

Question

My Eclipse CDT keeps complaining \"make: *** no rule to make target all\" when I am trying to compile the piece of code below:

#include 
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Answer 1

Project -> Clean -> Clean all Projects and then Project -> Build Project worked for me (I did the un-checking generate make-file automatically and then rechecking it before doing this). This was for an AVR (micro-processor programming) project through the AVR CDT plugin in eclipse Juno though.