Add dbus to check_dependencies.py for Linux.

scripts/check_dependencies.py

@@ -47,6 +47,7 @@ except ImportError:
     nose = None
 
 IS_WIN = sys.platform.startswith('win')
+IS_LIN = sys.platform.startswith('lin')
 
 
 VERS = {
@@ -67,6 +68,12 @@ WIN32_MODULES = [
     'icu',
 ]
 
+LINUX_MODULES = [
+    # Optical drive detection.
+    'dbus',
+]
+
+
 MODULES = [
     'PyQt4',
     'PyQt4.QtCore',
@@ -229,6 +236,10 @@ def main():
         print('Checking for Windows specific modules...')
         for m in WIN32_MODULES:
             check_module(m)
+    elif IS_LIN:
+        print('Checking for Linux specific modules...')
+        for m in LINUX_MODULES:
+            check_module(m)
     verify_versions()
     print_qt_image_formats()
     print_enchant_backends_and_languages()