This tutorial will explain how to build a native QtCreator 4.12.2 to run on a Raspberry Pi using Qt 5.12 or later. You might wonder, "Why 4.12, isn't that old already ?". It is, the latest releases are in the 4.14 branch, but unfortunately it has build dependencies that the current version of Raspbian does not yet fullfill (LLVM 10 or 11).
Remove any installed Qt packages
For some reason installed Qt libraries might cause link failures, so we need to get rid of them first. So if you have an older Qt 5 already installed from distro packages, remove them first with apt:
apt remove <list-all-installed-qt-packages-here>
Build and install Qt 5.12 or later
First you need to various build tool and of course build Qt 5 for your Raspberry Pi, for example if using Qt 5.12, follow this Qt build tutorial for instructions on how to install required packages and building of Qt 5. Note that the deprecated QtScript module is required for QtCreator, so make sure you enable it when building Qt 5. Or have it built separately.
When you have done that succesfully, come back here.
Install required packages
No need to install other that Qt 5 and what it requires for building.
Download QtCreator source archive
Unpack the QtCreator sources from the archive
tar xf qt-creator-opensource-src-4.12.4.tar.xz
Configure the QtCreator build
Run qmake against the sources. We will assume that Qt 5.12.10 is installed in /opt/Qt/5.12.10 (and if not, adjust the path for your installation)
cd qt-creator-opensource-src-4.12.4 /opt/Qt/5.12.10/bin/qmake -r
Next start the compilation. This will take a while
Next install the just built QtCreator, you can use whatever path you like, I prefer installing custom software under /opt.
make install INSTALL_ROOT=/opt/Qt/QtCreator4.12
You should now be able to start QtCreator with (running under X11):
/opt/Qt/QtCreator4.12/bin/qtcreator -platform xcb
You can also run it without X11, in that case just run without the platform parameter: