Add new dependency kactivities before kde-workspace.

kdesrc-buildrc-sample

@@ -226,12 +226,12 @@ end module-set
 # before the workspace and Plasma addons are compiled, and kdepimlibs itself
 # requires akonadi.
 # From there kde-workspace contains programs like Plasma Desktop and the KWin
-# window manager, kde-baseapps contains core applications, and I also add
-# konsole and kate since they are also very useful in general.
+# window manager (and requires kactivities), kde-baseapps contains core applications,
+# and I also add konsole and kate since they are also very useful in general.
 module-set
     repository kde-projects
 
-    use-modules akonadi kdepimlibs kde-workspace \
+    use-modules akonadi kdepimlibs kactivities kde-workspace \
                 kate kde-baseapps konsole
 end module-set