With this approach you can cross build a Windows binary on Linux using MXE (M cross environment).

You can find the build script and a README.md file in the ms-windows/mxe directory.

=== Building with Docker ===

This is the simplest way, but you need to have Docker installed

on your system.

You can use a Docker image to cross build QGIS by calling

the script ms-windows/mxe/build.sh from the root directory of QGIS repository.

=== Building without Docker ====

This requires to install mxe toolchain on your system and build

all dependencies by yourself.

==== Initial setup ====

==== Building the dependencies ====

Please see README.md under ms-windows/mxe for detailed instructions and for the

list of dependencies that need to be built in mxe before attempting to build QGIS.

==== Cross-Building QGIS ====

Edit the build-mxe.sh script and optionally adjust the path where your mxe installation is located, you

can also change the build and release directories.

Copy and unzip on the Windows machine package produced by the build and launch the qgis binary: no installation

is required.