GCC:
MSVC:

A Cross-platform USB Module for Qt built around libusb-1.0

• Bulk transfer
• Interrupt transfer
• Hotplug detection
• Device enumeration and filtering

Ubuntu

sudo add-apt-repository ppa:fpoussin/ppa
sudo apt install libqt5usb5 libqt5usb5-dev

Windows
Check the releases page or appveyor build artifacts for binary archives

Unix
You need libusb-1.0-0-dev and pkg-config packages installed

mkdir build && cd build
qmake ..
make install

MSVC 2017
You need WDK 8.1 and CRT SDK installed to compile libusb
These are both available from the Visual Studio Installer

build_msvc2017.bat [x64|x86] QT_PATH
ie: build_msvc2017.bat x64 C:\Qt\5.12.1\msvc2017_64

You'll need to add the module to your project file:

qt += usb

Then include it into your headers:

#include <QUsbDevice>
#include <QUsbInfo>
#include <QUsbTransferHandler>

QCH documentation files can be found with each release.
You have to manually install them in Qt Creator.

Ubuntu PPA
Windows binaries are in the releases section.