tdesktop/README.md

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# [Telegram Desktop][telegram_desktop] Official Messenger
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.
[![Version](https://badge.fury.io/gh/telegramdesktop%2Ftdesktop.svg)](https://github.com/telegramdesktop/tdesktop/releases)
[![Build Status](https://github.com/telegramdesktop/tdesktop/workflows/Windows./badge.svg)](https://github.com/telegramdesktop/tdesktop/actions)
[![Build Status](https://github.com/telegramdesktop/tdesktop/workflows/MacOS./badge.svg)](https://github.com/telegramdesktop/tdesktop/actions)
[![Build Status](https://github.com/telegramdesktop/tdesktop/workflows/Linux./badge.svg)](https://github.com/telegramdesktop/tdesktop/actions)
[![Preview of Telegram Desktop][preview_image]][preview_image_url]
The source code is published under GPLv3 with OpenSSL exception, the license is available [here][license].
## Supported systems
The latest version is available for
* [Windows 7 and above](https://telegram.org/dl/desktop/win) ([portable](https://telegram.org/dl/desktop/win_portable))
* [macOS 10.12 and above](https://telegram.org/dl/desktop/mac)
* [OS X 10.10 and 10.11](https://telegram.org/dl/desktop/osx)
* [Linux static build for 64 bit](https://telegram.org/dl/desktop/linux) ([32 bit](https://telegram.org/dl/desktop/linux32))
* [Snap](https://snapcraft.io/telegram-desktop)
* [Flatpak](https://flathub.org/apps/details/org.telegram.desktop)
## Old system versions
Version **1.8.15** was the last that supports older systems
* [Windows XP and Vista](https://updates.tdesktop.com/tsetup/tsetup.1.8.15.exe) ([portable](https://updates.tdesktop.com/tsetup/tportable.1.8.15.zip))
* [OS X 10.8 and 10.9](https://updates.tdesktop.com/tmac/tsetup.1.8.15.dmg)
* [OS X 10.6 and 10.7](https://updates.tdesktop.com/tmac32/tsetup32.1.8.15.dmg)
## Third-party
* Qt 5.12.8, 5.6.2 and 5.3.2 slightly patched ([LGPL](http://doc.qt.io/qt-5/lgpl.html))
* OpenSSL 1.1.1 and 1.0.1 ([OpenSSL License](https://www.openssl.org/source/license.html))
* WebRTC ([New BSD License](https://github.com/desktop-app/tg_owt/blob/master/src/LICENSE))
* zlib 1.2.11 ([zlib License](http://www.zlib.net/zlib_license.html))
* LZMA SDK 9.20 ([public domain](http://www.7-zip.org/sdk.html))
* liblzma ([public domain](http://tukaani.org/xz/))
* 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))
* GYP ([BSD License](https://github.com/bnoordhuis/gyp/blob/master/LICENSE))
* Ninja ([Apache License 2.0](https://github.com/ninja-build/ninja/blob/master/COPYING))
* OpenAL Soft ([LGPL](https://github.com/kcat/openal-soft/blob/master/COPYING))
* Opus codec ([BSD License](http://www.opus-codec.org/license/))
* FFmpeg ([LGPL](https://www.ffmpeg.org/legal.html))
* Guideline Support Library ([MIT License](https://github.com/Microsoft/GSL/blob/master/LICENSE))
* Range-v3 ([Boost License](https://github.com/ericniebler/range-v3/blob/master/LICENSE.txt))
* Open Sans font ([Apache License 2.0](http://www.apache.org/licenses/LICENSE-2.0.html))
* Vazir font ([License](https://github.com/rastikerdar/vazir-font/blob/master/LICENSE))
* Emoji alpha codes ([MIT License](https://github.com/emojione/emojione/blob/master/extras/alpha-codes/LICENSE.md))
* Catch test framework ([Boost License](https://github.com/philsquared/Catch/blob/master/LICENSE.txt))
* xxHash ([BSD License](https://github.com/Cyan4973/xxHash/blob/dev/LICENSE))
* QR Code generator ([MIT License](https://github.com/nayuki/QR-Code-generator#license))
* CMake ([New BSD License](https://github.com/Kitware/CMake/blob/master/Copyright.txt))
* Hunspell ([GPL](https://github.com/hunspell/hunspell/blob/master/COPYING))
## Build instructions
* [Visual Studio 2019][msvc]
* [Xcode 12][xcode]
* [CMake on GNU/Linux][cmake]
[//]: # (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
[msvc]: docs/building-msvc.md
[xcode]: docs/building-xcode.md
[xcode_old]: docs/building-xcode-old.md
[cmake]: docs/building-cmake.md
[preview_image]: https://github.com/telegramdesktop/tdesktop/blob/dev/docs/assets/preview.png "Preview of Telegram Desktop"
[preview_image_url]: https://raw.githubusercontent.com/telegramdesktop/tdesktop/dev/docs/assets/preview.png