Build mongoose 6.15

General
#1

If you are asking a question, please follow this template:

  1. My goal is: [build mongoose 6.15]
  2. My actions are: [before i use mongoose3.1, now download mongoose-6.15.tar.gz from github]
  3. My expectation & question is: [the code tree is most different with 3.1, I can’t build it ]

Thanks