readme: call to 'dunecontrol all' is the same for ubuntu and mac os x

README.md

@@ -158,12 +158,6 @@ These instructions are suitable for a clean **Ubuntu** or **Mac OS X** setup. Th
     to enfore the Homebrew'd GCC compiler. Note that this variable export only lasts for your current terminal session. Always make sure that the configuration tool actually finds GCC instead of the Apple Clang.
 
 4. Clone the DUNE modules and DORiE into a suitable folder on your machine. Make sure that you check out the correct branches (see above). Enter the parent folder, and call
-    
-    **Ubuntu:**
-
-        CMAKE_FLAGS="-DDUNE_PYTHON_VIRTUALENV_SETUP=True -DDUNE_PYTHON_ALLOW_GET_PIP=True" MAKE_FLAGS="-j <N>" ./dune-common/bin/dunecontrol all
-
-    **Mac OS X:**
 
         CMAKE_FLAGS="-DDUNE_PYTHON_VIRTUALENV_SETUP=True -DDUNE_PYTHON_ALLOW_GET_PIP=True" MAKE_FLAGS="-j <N>" ./dune-common/bin/dunecontrol all