This is the complete source code and the build instructions for the alpha version of the official desktop client for the Telegram messenger, based on the Telegram API and the MTProto secure protocol.

The source code is published under GPLv3 with OpenSSL exception, the license is available here.

• Windows XP - Windows 10 (not RT)
• Mac OS X 10.8 - Mac OS X 10.15
• Mac OS X 10.6 - Mac OS X 10.7 (separate build)
• Ubuntu 12.04 - Ubuntu 19.04
• Fedora 22 - Fedora 30
• Snappy
• Flathub

• Qt 5.3.2 and 5.6.2, slightly patched (LGPL)
• OpenSSL 1.0.1g (OpenSSL License)
• zlib 1.2.8 (zlib License)
• libexif 0.6.20 (LGPL)
• LZMA SDK 9.20 (public domain)
• liblzma (public domain)
• Google Breakpad (License)
• Google Crashpad (Apache License 2.0)
• GYP (BSD License)
• Ninja (Apache License 2.0)
• OpenAL Soft (LGPL)
• Opus codec (BSD License)
• FFmpeg (LGPL)
• Guideline Support Library (MIT License)
• Mapbox Variant (BSD License)
• Range-v3 (Boost License)
• Open Sans font (Apache License 2.0)
• Emoji alpha codes (MIT License)
• Catch test framework (Boost License)
• xxHash (BSD License)

• Visual Studio 2019
• Xcode 10
• GYP/CMake on GNU/Linux