https://stackoverflow.com/questions/527 ... ault-prefi
No where in the directions for "Solar Geometry" do I see reference to MSys or MSys2.
I suggest you install the compiler toolchain and base development file. No idea if you editing /etc/fstab will cause problems. I do not normmaly edit it!
Install MinGW Package build packages. You might need more packages installed.
pacman -S --needed base-devel mingw-w64-x86_64-toolchain