It's not used by xdot. Fixes #51.
@@ -31,7 +31,6 @@ setup(
""",
license="LGPL",
- install_requires=['graphviz'],
packages=['xdot', 'xdot/dot', 'xdot/ui'],
entry_points=dict(gui_scripts=['xdot=xdot.__main__:main']),