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# [Telegram Desktop][telegram_desktop] –
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This is the complete source code and the build instructions for the alpha version of the official desktop client for the [Telegram][telegram] messenger, based on the [Telegram API][telegram_api] and the [MTProto][telegram_proto] secure protocol.
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The source code is published under GPLv3 with OpenSSL exception, the license is available [here][license].
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## Supported systems
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* Windows XP - Windows 10 (**not** RT)
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* Mac OS X 10.8 - Mac OS X 10.10
* Mac OS X 10.6 - Mac OS X 10.7 (separate build)
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* Ubuntu 12.04 - Ubuntu 14.04
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* Fedora 22
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## Third-party libraries
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* Qt 5.3.2 and 5.5.1, slightly patched ([LGPL](http://doc.qt.io/qt-5/lgpl.html))
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* OpenSSL 1.0.1g ([OpenSSL License](https://www.openssl.org/source/license.html))
* zlib 1.2.8 ([zlib License](http://www.zlib.net/zlib_license.html))
* libexif 0.6.20 ([LGPL](https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html))
* LZMA SDK 9.20 ([public domain](http://www.7-zip.org/sdk.html))
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* liblzma ([public domain](http://tukaani.org/xz/))
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* Google Breakpad ([License](https://chromium.googlesource.com/breakpad/breakpad/+/master/LICENSE))
* Google Crashpad ([Apache License 2.0](https://chromium.googlesource.com/crashpad/crashpad/+/master/LICENSE))
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* OpenAL Soft ([LGPL](http://kcat.strangesoft.net/openal.html))
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* Opus codec ([BSD license](http://www.opus-codec.org/license/))
* FFmpeg ([LGPL](https://www.ffmpeg.org/legal.html))
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* Open Sans font ([Apache License 2.0](http://www.apache.org/licenses/LICENSE-2.0.html))
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## Build instructions
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* [Visual Studio 2015][msvc]
* [XCode 7][xcode]
* [XCode 7 for OS X 10.6 and 10.7][xcode_old]
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* [Qt Creator 3.5.1 Ubuntu][qtcreator]
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* [Using qmake on GNU/Linux][qmake]
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## Projects in Telegram solution
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* ### Telegram
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[Telegram Desktop][telegram_desktop] messenger
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* ### Updater
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A little app, that is launched by Telegram when update is ready, replaces all files and launches it back.
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* ### Packer
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Compiles given files to single update file, compresses it with lzma and signs with a private key. It is not built in **Debug** and **Release** configurations of Telegram solution, because private key is inaccessible.
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* ### MetaEmoji
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Creates four sprites and text2emoji replace code
* SourceFiles/art/emoji.png
* SourceFiles/art/emoji_125x.png
* SourceFiles/art/emoji_150x.png
* SourceFiles/art/emoji_200x.png
* SourceFiles/art/emoji_250x.png
* SourceFiles/gui/emoji_config.cpp
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* ### MetaStyle
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From two files and two sprites
* Resources/style_classes.txt
* Resources/style.txt
* SourceFiles/art/sprite.png
* SourceFiles/art/sprite_200x.png
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Creates two other sprites, four sprite grids and style constants code
* SourceFiles/art/sprite_125x.png
* SourceFiles/art/sprite_150x.png
* SourceFiles/art/grid.png
* SourceFiles/art/grid_125x.png
* SourceFiles/art/grid_150x.png
* SourceFiles/art/grid_200x.png
* GeneratedFiles/style_classes.h
* GeneratedFiles/style_auto.h
* GeneratedFiles/style_auto.cpp
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* ### MetaLang
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Creates from languagepack file `Resources/lang.txt` language constants code and language file parse code:
* GeneratedFiles/lang.h
* GeneratedFiles/lang.cpp
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[//]: # (LINKS)
[telegram]: https://telegram.org
[telegram_desktop]: https://desktop.telegram.org
[telegram_api]: https://core.telegram.org
[telegram_proto]: https://core.telegram.org/mtproto
[license]: LICENSE
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[msvc]: doc/building-msvc.md
[xcode]: doc/building-xcode.md
[xcode_old]: doc/building-xcode-old.md
[qtcreator]: doc/building-qtcreator.md
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[qmake]: doc/building-qmake.md
