Remove missing and optional dependencies
--- a/setup.py
+++ b/setup.py
@@ -21,7 +21,8 @@
 
 # Debian: exclude packages which may not be found at runtime due to their
 # packaging
-exclude = ('pyqt5', 'qscintilla', 'qtconsole', 'PyQtChart')
+exclude = ('pyqt5', 'qscintilla', 'qtconsole', 'PyQtChart',
+           'pgzero', 'gpiozero', 'guizero', 'pigpio', 'nudatus')
 install_requires = [requirement for requirement in install_requires
                     if not requirement.startswith(exclude)]
 
