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enter image description here As shown in the figure, what the difference between :=, ?= and = I did a quick search without find out a good answer. Appreciate it.

Charles Lu
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    Check out the [GNU Make Manual](http://www.gnu.org/software/make/manual/make.html). Sections 3.7, 6.2 and 6.3 for starters. – Timothy Brown May 17 '15 at 16:25
  • Please find a good answer here: http://stackoverflow.com/questions/448910/makefile-variable-assignment – Ron Kuper May 17 '15 at 16:35

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