How to use FPM to link external library in my existing fortran90 project?

[xushanthu-2014]

Thanks for providing this nice package to handle the management of packages in fortran!
I am a beginner of Fortran90 and now I want to do some innovations to embed machine learning algorithms in one atmospheric model which is written by fortran 90. I found FKB could handle this. The atmospheric model use make to compile Makefile. And I put this Makefile in a google document here: https://docs.google.com/document/d/10naj1WgE9P4qbILT3n85TosZCd1KISwSzGw2u5FIOwo/edit. The FKB uses CMake and CMakelist.txt to generate libneural.a in the directory ./build/lib and mod_xxx.mod in the directory ./build/include.

I see in your readme file you said that FPM could help people to handle external library into existing fortran90 project.
So how can I use your FPM to link FKB or neural-fortran to my project? I suppose I should put the library file .o in the library directory of my existing model? or put the .mod in my .mod directory of the atmospheric model? And after that, what should I do? how can I embed Cmakelist.txt from FKB into the Makefile of my atmospheric model?
Thanks!