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diff --git a/docs/BUILDING.md b/docs/BUILDING.md
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@@ -200,6 +200,9 @@ This is sufficient to get uscxml to build. If you want some more functionality,
# expect invoker
$ sudo yum install expect-devel tk-devel
+ # instant messaging invoker
+ $ sudo yum install libpurple-devel
+
### Console / Make
Instructions are a literal copy of building uscxml for MacOSX on the console from above: