I want to use the GMP (https://gmplib.org/) on Windows, so i downloaded the folder called gmp-6.1.0 and tried to use mingw32-make.exe on it. It printed: "mingw32-make: *** No targets specified and no makefile found. Stop." But there is a Makefile.in in the folder. When i tried "mingw32.exe Makefile.in" it printed out "Nothing to be done for Makefile.in".
I really don't know what to do here, since a guy over here: How to compile makefile using MinGW? said i'd just need to mingw32.exe makefile.in