Either from PyPI:
python3 -m pip install makemake90
Or from GitHub:
python3 -m pip install git+https://github.com/janberges/makemake90
Generate Makefile for all .f90 files in the current directory and its
subdirectories, optionally indicating special directories of your project:
makemake90 src=src obj=build mod=build bin=bin
Customize Makefile preamble (before the line with generated by makemake):
$EDITOR Makefile
Build your project:
make FC=gfortran FFLAGS=-O3
Update Makefile after further work on project:
makemake90