Custom build of Qt5

This is part of a series of posts on compiling a custom version of Qt5 in order to develop for both amd64 and a Raspberry Pi.

A customer needs a procedure for a custom build of Qt5 5.15, the last LTS release of Qt 5.

They develop for industrial systems that are managed by an amd64 industrial computer. This computer is accessed either through an attached panel touch screen, or through touch screens driven by Raspberry Pi clients connected via an internal ethernet network.

The control interfaces use mostly a full screen Qt5 application. The customer relies heavily on Qt5, has a full Enterprise license, and needs to stay on top of the most recent releases, to make use of new features or bug fixes that have made it upstream since the last Debian stable was released.

This is a list of requirements for this job:

To make things easier, .deb packages are for internal use only and do not need to be compliant with Debian policy.

I estimate a difficulty level of: "Bring the One Ring to Mount Doom and remember to get milk on the way back".

The journey begins.

The resulting packaging is at