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.. _install_deps:
Installation of dependencies
============================
The dependencies `Ghostscript <https://www.ghostscript.com>`_ and `Tkinter <https://wiki.python.org/moin/TkInter>`_ can be installed using your system's package manager or by running their installer.
OS-specific instructions
------------------------
Ubuntu
^^^^^^
::
$ apt install ghostscript python3-tk
MacOS
^^^^^
::
$ brew install ghostscript tcl-tk
Windows
^^^^^^^
For Ghostscript, you can get the installer at their `downloads page <https://www.ghostscript.com/download/gsdnld.html>`_. And for Tkinter, you can download the `ActiveTcl Community Edition <https://www.activestate.com/activetcl/downloads>`_ from ActiveState.
Checks to see if dependencies are installed correctly
-----------------------------------------------------
You can run the following checks to see if the dependencies were installed correctly.
For Ghostscript
^^^^^^^^^^^^^^^
Open the Python REPL and run the following:
For Ubuntu/MacOS::
>>> from ctypes.util import find_library
>>> find_library("gs")
"libgs.so.9"
For Windows::
>>> import ctypes
>>> from ctypes.util import find_library
>>> find_library("".join(("gsdll", str(ctypes.sizeof(ctypes.c_voidp) * 8), ".dll")))
<name-of-ghostscript-library-on-windows>
**Check:** The output of the ``find_library`` function should not be empty.
If the output is empty, then it's possible that the Ghostscript library is not available one of the ``LD_LIBRARY_PATH``/``DYLD_LIBRARY_PATH``/``PATH`` variables depending on your operating system. In this case, you may have to modify one of those path variables.
For Tkinter
^^^^^^^^^^^
Launch Python and then import Tkinter::
>>> import tkinter
**Check:** Importing ``tkinter`` should not raise an import error.
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