How to build QT6 with specific ICU version in Linux and why ICU dependency isn't seen on Windows?

[Qt6User]

We are using qt6 version 6.8.1 in linux we see that it depends on ICU version 73.

[root@d986805cb9ef test]# ldd libQt6Core.so.6.8.1
        linux-vdso.so.1 (0x00007ffebb7bf000)
        libicui18n.so.73 => not found
        libicuuc.so.73 => not found
        libicudata.so.73 => not found

My questions -

a) Is it possible to build QT6 with specific ICU version for e.g. say 76 instead of 73?
Can anyone please share the required flags and other relevant instructions/process i should be aware of?

b) Why i don't see ICU dependency on Qt6Core in Windows BUT I can see it on Linux?

On Windows:

On Linux :

[Bonnie]

a) Yes. Build Qt6 yourself and link the ICU version you want
b) The prebuilt Qt6 on windows is not built with ICU support
You can get the building flags from https://wiki.qt.io/Qt_6.8_Tools_and_Versions
I had replied in this thread about how to build Qt6Core only with ICU support on Windows, you may take that as a reference.