How build Windows executable

[PABLOCORRO]

Hello everybody
I would like help, could you guide me on how to build the executable for dwg2dxf.c. I know only the basics of C ++ but no more.
I have installed MSYS64 successfully and C:\msys64\mingw64\bin contains tools. I have run the commands: automake, aclocal, configure; but I have not been able to generate the .exe for dwg2dxf.c
What are the commands that I should execute? and in what order?

[rurban]

See the recipes in .appveyor.yml and .github/workflow/main.yml