new entries

library/_toc.md

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 # Popular required libraries
 
 - [Boost](boost.md)
+- [LZMA SDK](lzma.md)
 - [Simple DirectMedia Layer (SDL 2)](sdl_2.md)
+- [Simple and Fast Multimedia Library](sfml.md)
+- [XZ Utils](xz.md)
+- [libpng](libpng.md)
+- [zlib](zlib.md)

library/libpng.md

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+# libpng
+
+_libpng is the official PNG reference library._
+
+- Home: http://libpng.org/pub/png/libpng.html
+- Wikipedia: https://en.wikipedia.org/wiki/Libpng
+- Download: see home
+- State: mature, official
+- Code: https://sourceforge.net/p/libpng/code/ci/master/tree/
+- Language(s): C
+- License: [libpng](https://sourceforge.net/p/libpng/code/ci/master/tree/LICENSE)
+
+## Building
+
+2017-12
+- On Windows CMake fails with "No CMAKE_ASM_COMPILER could be found." on "project(.. ASM)" with MSVC 2015 as generator
+

library/lzma.md

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+# LZMA SDK
+
+_The LZMA SDK provides the documentation, samples, header files, libraries, and tools you need to develop applications that use LZMA compression._
+
+- Home: http://7-zip.org/
+- Wikipedia: https://en.wikipedia.org/wiki/Lempel%E2%80%93Ziv%E2%80%93Markov_chain_algorithm
+- Download: http://7-zip.org/download.html http://7-zip.org/sdk.html
+- State: mature
+- Code: see download
+- Language(s): C
+- License: LGPL-2.0
+
+Windows only.
+For Linux see [p7zip](https://sourceforge.net/projects/p7zip/), a command line tool (see also [here](https://www.linux.com/learn/handling-rar-and-7-zip-archives-linux)).
+
+## Building
+
+The binary LZMA SDK is licensed as PD.
+

library/sfml.md

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+# Simple and Fast Multimedia Library
+
+_SFML provides a simple interface to the various components of your PC._
+
+- Home: https://www.sfml-dev.org/
+- Wikipedia: https://en.wikipedia.org/wiki/Simple_and_Fast_Multimedia_Library
+- Download: https://www.sfml-dev.org/download.php
+- State: mature
+- Code: https://github.com/SFML/SFML
+- Language(s): C++
+- License: zlib (core)
+
+## Building
+
+Uses CMake
+
+Does not contain tests.
+
+Includes precompiled libraries for various compilers in source folder _extlibs_.
+
+2017-12
+- Windows, CMake, MSVC 2015 builds
+

library/xz.md

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+# XZ Utils
+
+_{One line description}_
+
+- Home: https://tukaani.org/xz/
+- Wikipedia: https://en.wikipedia.org/wiki/XZ_Utils
+- Download: see home
+- State: mature
+- Code: https://git.tukaani.org/?p=xz.git
+- Language(s): C
+- License: Different, see file Copying, liblzma is public domain
+
+Python support [lzma](https://docs.python.org/3/library/lzma.html)
+
+Supersedes [LZMA Utils](https://tukaani.org/lzma/)
+
+## Building
+
+See building instructions in source folder windows.
+

library/zlib.md

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+# zlib
+
+_zlib is a software library used for data compression._
+
+- Home: http://zlib.net/
+- Wikipedia: https://en.wikipedia.org/wiki/Zlib
+- State: mature
+- Code: https://github.com/madler/zlib
+- Language(s): C
+- License: zlib
+
+## Building
+
+Uses CMake
+