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+[[!comment format=mdwn
+ username="joey"
+ subject="""comment 1"""
+ date="2014-12-07T15:58:03Z"
+ content="""
+I have heard of propellor being used on OSX. Probably that user wrote their
+own code for OSX specific stuff.
+
+Propellor properites can be parameterized by OS. Currently it has support
+for Debian and some untested support for Ubuntu. A property can be parameterized
+like this:
+
+[[!format haskell """
+foo :: Property
+foo = property "foo" withOS desc $ \o -> case o of
+                (Just (System (Debian _) _)) -> ensureProperty fooDebian
+                (Just (System (Ubuntu _) _)) -> ensureProperty fooUbuntu
+
+The first step for adding a new OS will be to modify <http://hackage.haskell.org/package/propellor-1.0.0/docs/Propellor-Types-OS.html>.
+Compilation will then warn about all OS parameterized properties that
+need to be updated to support your added OS, and it can be taken from there.
+
+I'll accept reasonable patches to support other OS's.
+"""]]
+