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## Notice about modified Qt
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 If you are using Windows version of OpenToonz installed from the installer 
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 provided from OpenToonz website (https://opentoonz.github.io/), Qt libraries 
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 distributed with the software may be our customized version. 
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 The other OS versions (macOS, Linux) are not the case. 
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### To check whether the Qt libraries are customized.
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  - Launch OpenToonz.
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  - Open Preferences.
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  - Check if there is a checkbox "Use Qt's Native Windows Ink Support" in the 
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    "Touch / Tablet Settings" category.
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  If the option exists, Qt libraries are customized version (Qt 5.15.2 with WinTab support).
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----------
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## About Qt 5.15.2 with WinTab support
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  This version is made based on v5.15.2 with cherry-picking the following commit 
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  to the qtbase module, in order to make it enable to use WinTab API in Qt 5.15.2:
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  commit id: [4c4693cf964e9d7370c27a26e1d263a262aee568](https://github.com/shun-iwasawa/qtbase/commit/4c4693cf964e9d7370c27a26e1d263a262aee568)
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  commit title: Windows: Provide a way to switch between WinTab and Windows Ink at run-time
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### Source Code
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  You can find the source code tree to build this package and track the modification here:
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  https://github.com/shun-iwasawa/qt5/tree/v5.15.2_wintab
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### Build Configurations
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  The attached package is built by the following command lines:
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  ```
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  > configure -debug-and-release -opensource -confirm-license -prefix ../build -make libs -no-pch -openssl OPENSSL_PREFIX="path\to\OpenSSL-Win64" -opengl dynamic
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  > jom -j4
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  > jom module-qtscript -j4
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  > jom install
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  ```
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### Dependent Libraries
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luz paz 67b4e9
  The attached package is built by using the following libraries/software:
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  - OpenSSL Toolkit 1.1.1j 
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    [Binary package from Shining Light Productions](https://slproweb.com/products/Win32OpenSSL.html)
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  - Perl
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    [ActivePerl 5.28](https://www.activestate.com/products/perl/downloads/)
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  - [Python 2.7.18](https://www.python.org/downloads/release/python-2718/)
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  - [Ruby 2.7.2-1 (x64)](https://rubyinstaller.org/downloads/)
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  - ANGLE : already included in the repository.
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  - Microsoft Visual Studio Community 2019
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  - [jom](https://wiki.qt.io/Jom)
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  - ICU : Not used.
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#### Reference: 
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  - [Qt for Windows - Requirements](https://doc.qt.io/qt-5/windows-requirements.html)
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  - [Qt for Windows - Building from Source](https://doc.qt.io/qt-5/windows-building.html)
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----------
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March 26, 2021
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Shun Iwasawa, OpenToonz team
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