In order to build the natives you need :
 * C++ compiler - gcc for example
 * [http://en.wikipedia.org/wiki/Make_(software) make] - [http://www.gnu.org/software/make/ gnu make]

To build the natives on MS Windows
 * for a compiler you can use [http://www.mingw.org/ MinGW] - minimalist GNU for Windows
 * also you will need a bash (like) shell for the configure and make files - [http://www.mingw.org/ msys], minimal system (Bourne shell), part of [http://www.mingw.org/ MinGW] project

There are two ways to install [http://www.mingw.org/ MinGW]. The first one is to use installer. This is the preffered way but right now the installer downloads a w32api-mingw32 that is a corrupt file. So this way doesn't work (at least at the moment of wrting of this document). The other one is manual installation.

Steps for manual installation:
 * create a directory named 'msys'
 * in it create a directory named 'mingw'
  * For example : C:/msys/mingw
 * download from the minGW project, there is a convenient archive file that contains them all - [http://asteasolutions.net/~nenko]:
  * binutils - (version used in this document is 2.19.1)
  * gcc-core - (version used in this document is 4.2.1)
  * gcc-g++ - (version used in this document is 4.2.1)
  * mingwrt - (version used in this document is 3.15.2)
  * mingwrt-mingw32dll - (version used in this document is 3.15.2)
  * w32api-mingw32-dev - should be at least 3.13 version in order to build ffmpeg (version used in this document is 3.13)
  * extract all files to msys/mingw directory 
  * go to msys/mingw/bin directory and rename 
   * c++-sjlj.exe to c++.exe
   * cpp-sjlj.exe to cpp.exe
   * g++-sjlj.exe to g++.exe
   * gcc-sjlj.exe to gcc.exe
  * download msys - (version used in this document is 1.0.11)
  * install msys to msys/ directory created before - it is very important to install msys, after you install [http://www.mingw.org/ MinGW], otherwise you should make changes in the configuration of msys
   * For example: C:/msys
  * if everything is OK a console should be opened and you will be promted whether have a [http://www.mingw.org/ MinGW] installed and where it is
  * download and unpack 'coreutils'. The unpacked folder contains many UNIX commands and you can copy the one you need. For building ffmpeg you need 'pr'. So copy pr.exe to msys/bin directory
  * checout the natives from the svn
   * svn co svn://sophie2.org/sophie2/branches/private/nenko/natives2/sophie2-natives
  * the folder structure in sophie2-natives is the following:
   * lib-src - containing the source code for the libraries we depend on
   * lib-target - contains the built libraries
   * src - contains the natives code
   * junk - contains junk. The building happens in this folder


To build the ffmpeg library:
 * start msys - usually there's an icon on the Desktop
  * you will see bash (like) console. You can access your local drives with the following command: 
   * cd c:/msys/ 
   * cd c:
  * go to sophie2-native 
   * For example: cd c:/sophie2-natives/
   * create a text file custom.mk that contains the line - PLATF=win32
   * go to sophie2-native/lib-src
    * For example: cd c:/sophie2-natives/lib-src or cd lib-src
   * execute make ffmpeg or make all (make all will build all libraries)
    * For example: make ffmpeg

References:

http://www.mingw.org/ [[BR]]
http://ffmpeg.arrozcru.org/wiki/index.php?title=MSys_MinGW [[BR]]
http://en.wikipedia.org/wiki/Make_(software) [[BR]]
http://www.gnu.org/software/make/ [[BR]]
http://asteasolutions.net/~nenko [[BR]]

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