qt-build-tools/README.md

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# Qt build tools and patches
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This is a set of build tools and required patches to build Qt yourself and distribute it along with your app on macOS and Windows.
### macOS
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For macOS we currently distribute two binaries:
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- Modern, compiled with [Qt 5.15.16](5.15.16) for macOS 10.13+. If you do not own a commercial license, you can use older [Qt 5.15.x](https://crystalidea.com/blog/qt-5-15-lts-commercial-source-code).
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- Legacy, compiled with [Qt 5.6.3](5.6.3) for macOS 10.7-10.12. The folder contains several macOS-related patches ([QTBUG-40583](https://bugreports.qt.io/browse/QTBUG-40583), [QTBUG-18624](https://bugreports.qt.io/browse/QTBUG-18624), [QTBUG-52536](https://bugreports.qt.io/browse/QTBUG-52536), [QTBUG-63451](https://bugreports.qt.io/browse/QTBUG-63451) ) already applied in order to be compiled and used normally. To compile Qt 5.6.3 we use macOS 10.13 and XCode 8.
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To apply patches and compile Qt the same as we do, simply copy the contents of the folder ([Qt 5.15.16](5.15.16) or [Qt 5.6.3](5.6.3)) to the official Qt source tree (overwriting existing files of cause).
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Compiling your app with both modern and legacy Qt can be done on modern macOS with [XCode](https://apps.apple.com/us/app/xcode/id497799835?mt=12).
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When compiling a project with Qt 5.6.3 on arm64 host machine some additional steps are required in your .pro file:
```bash
# compiler flags:
QMAKE_CXXFLAGS += "-arch x86_64"
QMAKE_CFLAGS += "-arch x86_64"
QMAKE_LFLAGS += "-arch x86_64"
# linker flags, required to support 10.7, otherwise minimum deployment target is 10.9
QMAKE_LFLAGS += "-stdlib=libc++"
```
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### Windows
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On Windows you need [VS2019 Community Edition](https://visualstudio.microsoft.com/downloads/) and [Perl](https://strawberryperl.com/). QtNetwork module is compiled using openssl-3.0.13 which is pre-compiled but once you delete the folder, it will be compiled again.