I've been working on my Qt program for not quite two months, and it works on both Linux and BSD. I cross-compiled it for Windows, using MinGW, before adding the GUI to it. I'm leaving in a week to help a friend of mine, who is also a surveyor, set up his computers to build it. He has MinGW on Windows. I've read that there are package managers, such as wpkg and NuGet, which do on Windows something similar to apt-get and rpm on Linux and pkg and pkgsrc on BSD. What do you recommend so that he can make a package and someone installs it and the package manager fetches the correct version of the Qt libraries?