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The Lazarus Component Library, abbreviated LCL, is a visual software component library for the Lazarus IDE.

The LCL consists of a collection of units that provide components and classes especially for visual tasks. It is based on the Free Pascal libraries RTL and FCL. By binding platform-specific widgetsets it supports platform-sensitive software development for several operating systems including Android, Desktop Linux, Mac OS X and Windows. Lazarus source code files is under a mix of licenses: GNU General Public License, version 2 (GPLv2), a modified LGPL, and the MPL.^[1]

LCL supports GTK2, Qt4, Qt5, Qt6, fpGUI for BSD, Linux, macOS and Windows, Win32 for Windows, Cocoa for macOS, as well as MUI for Amiga systems and more.^[2]

• Widgetset

• Michaël van Canneyt; Florian Klämpfl (2012), Free Pascal (Free Pascal 2 ed.), Computer & Literatur Verlag GmbH, ISBN 978-3936546729, OL 25421359M, 393654672X
• Michaël van Canneyt; Mattias Gärtner; Swen Heinig; Felipe Monteiro de Carvalho; Inoussa Ouedraogo; Jörg Braun (2011), Lazarus, Böblingen, Germany: Computer & Literatur Verlag GmbH, OL 25426539M
• Michaël van Canneyt; Mathias Gärtner; Swen Heinig; Felipe Monteiro de Carvalho; Inoussa Ouedraogo (2011), Lazarus - the complete guide, Blaise Pascal Magazine, OL 25427992M
• Roderick Person (2013), Getting Started with Lazarus IDE, Packt Publishing, ISBN 978-1782163404, OL 25426631M, 1782163409
• Menkaura Abiola-Ellison (2015), Getting Started with Lazarus and Free Pascal, Mka publishing, ISBN 978-1507632529

• LCL documentation in the Free Pascal Wiki
• Complete online reference