Learn how to cross-compile and build OpenVPN-GUI

Objective: Learn how to cross-compile and build OpenVPN-GUI for Microsoft Windows 64bit OS using Ubuntu 64bit. Based on what I read about OpenVPN-GUI, it cannot be built without first cross-compiling and building OpenSSL. I was told the recommended tool to use for cross-compilation is MinGW-w64. I was further told that you do not have to use MinGW-w64 if you are using Linux as the host computer as all the toolchains of MinGW-w64 are available on all Linux variants' standard repositories. The source codes for both OpenVPN-GUI and OpenSSL are available at their respective websites or you may download them from this post. The successful bidder will have to teach me step-by-step how to achieve the above objective. If he/she uses any scripts or any additional open-source software, he/she will have to provide them to me. Note: All of the software that you need to use are open-source. No proprietary software is to be used.