Creating makefile

Question

I am trying to create the makefiles and configure for my library which its directory structure is like following:

 $projectroot
    ├── lib
    ├── src
    └── test
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Answer 1

Just list part1 and part2 as dependencies of part3:

all: part1 part2 part3

part1:
   MAKE PART1

part2: part1
   MAKE PART2

part3: part1 part2
   MAKE PART3