Qt 4.8.7 -

Add to your ~/.bashrc :

It was built for an era before C++11 became the baseline. While you can use newer C++ versions with it, the framework doesn't take advantage of modern move semantics or smart pointers natively. How to Get Started

: It is the last version to support certain older architectures and OS versions that newer Qt releases have dropped.

configure -platform win32-g++ -prefix C:\Qt\4.8.7 mingw32-make mingw32-make install qt 4.8.7

Many industrial machines, medical devices, and automotive interfaces were built on Qt 4. Changing the framework in these environments requires massive re-certification and testing. For these systems, "if it isn't broken, don't fix it" is the golden rule, and Qt 4.8.7 is the most stable version they can run. 2. Massive Legacy Codebases

While the world has largely moved on to Qt 5 and Qt 6, Qt 4.8.7 remains a critical piece of infrastructure for legacy systems, embedded devices, and long-term maintenance projects. What is Qt 4.8.7?

Alternate: https://download.qt.io/archive/qt/4.8/4.8.7/ Add to your ~/

Qt 4.8.7 is the "Old Faithful" of the C++ world. It marks the end of an era where desktop-first development was the primary focus. While it is not recommended for new projects, it remains a testament to high-quality software engineering—a version so solid that it refuses to fade away.

You get it from the official Qt online installer (only Qt 5+). Get source from:

sudo apt-get install build-essential libgl1-mesa-dev libglu1-mesa-dev \ libx11-dev libxext-dev libxtst-dev libxrender-dev libxrandr-dev \ libxcursor-dev libxfixes-dev libxi-dev libxinerama-dev libfreetype6-dev \ libfontconfig1-dev libdbus-1-dev libssl-dev configure -platform win32-g++ -prefix C:\Qt\4

Install Qt Creator 3.5.1 manually:

Best for Stack Overflow, Reddit, or a developer Twitter thread.

| Scenario | Recommendation | |-----------------------------------|------------------------------------------------| | You maintain legacy product | Stick to 4.8.7, use known toolchain (GCC 4.9) | | You want to learn Qt | Use Qt 5.15 LTS or Qt 6 | | Embedded Linux with old rootfs | 4.8.7 is fine, cross-compile with arm-linux | | You need Qt 4.8.7 for testing | Use Docker: ubuntu:16.04 + build from source|