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Installation and usage of the Scyther tool
Requirements
To be able to use all of Scyther's features, the following three dependencies are needed. If you only require the back-end tool (used from the command line) then you need only the first.
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The GraphViz library
This library is used by the Scyther tool to draw graphs. It can be freely downloaded from:
http://www.graphviz.org/
Download the latest stable release and install it.
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Python
Stable releases of the Python interpreter are available from:
http://www.python.org/download/
Scyther does not support Python 3. You are therefore recommended to choose the latest production release of Python 2, e.g., Python 2.7.
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Mac OS X
If the package yields an error when you try to install it, please use the following, in the directory where you downloaded it:
$ sudo installer -pkg graphviz-2.34.0.pkg -target /
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wxPython libraries
The GUI user interface uses the wxPython libraries.
http://www.wxpython.org/download.php
There are many different wxPython packages. You should choose a 32-bit package that matches your Python version (e.g., 2.7). It is recommended to select the unicode version from the stable releases.
As of writing (May 2013) the following links lead to the appropriate wxPython packages for Python 2.7:
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Windows
http://downloads.sourceforge.net/wxpython/wxPython2.8-win32-unicode-2.8.12.1-py27.exe
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Mac OS X
http://downloads.sourceforge.net/wxpython/wxPython2.8-osx-unicode-2.8.12.1-universal-py2.7.dmg
Note that this package is in an old format and you will probably get a warning "Package is damaged". This can be resolved by:
$ sudo installer -pkg /Volume/.../wxPython2.8-osx-unicode-universal-py2.7.pkg/ -target / -
Ubuntu/Debian Linux
Running Scyther
Extract the Scyther archive and navigate to the extracted directory.
Start Scyther by executing the file
scyther-gui.py
in the main directory of the extracted archive.
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Mac OS X
Right-click the file 'scyther-gui.py' and select "Open with" and then "Python Launcher".