It is possible to complie open source software like „PuTTY“ using the famous gcc open source compiler.
Choose your favourite MinGW „distribution“
There are several „distribution“-like packages available on the web.
I found https://sourceforge.net/projects/mingw-w64/files/Toolchains%20targetting%20Win32/Personal%20Builds/mingw-builds/installer/mingw-w64-install.exe/download which worked „out of the box“.
Install MinGw
Just a few settings to think about, I chose:

I changed from the default-settings:
- Version:8.1.0
- Architecture:i686
- Threads:posix
- Exception:dwarf
- Build Revision:0

to
- Architecture:x86_64
- Threads:win32
- Exception:seh


Check the Windows „PATH“-Environment Variable
I should contain C:\\Program Files\\mingw-w64\\x86\_64-8.1.0-win32-seh-rt\_v6-rev0\\mingw64\\bin
Run a „MinGW-Terminal“
Using the following shortcut

