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qmake fails after lrelease failed

Project ERROR: Failed to run: 'lrelease.exe'

In 64bit Windows environment, 64bit and 32bit application have some different properties like the environment variables. You should use 64bit Command Prompt or Explorer to build a project with qmake in 64bit Windows.

qmake tutrial failed with “QPushButton: No such file or directory”

Add following line at the top of your hello.pro.

QT += widgets