OSX -> OS X

INSTALL

@@ -101,11 +101,11 @@ provided by Christoph Gohlke.  To install Kwant on Windows
    want to run this software?". Select "Run".
 
 
-Mac OSX
-=======
+Mac OS X
+========
 
 There is a number of different package managers for bringing software from the
-Unix/Linux world to Mac OSX. Since the community is quite split, we provide
+Unix/Linux world to Mac OS X. Since the community is quite split, we provide
 Kwant and its dependencies both via the `homebrew <http://brew.sh>`_ and the
 `MacPorts <http://www.macports.org>`_ systems.
 
@@ -113,7 +113,7 @@ Kwant and its dependencies both via the `homebrew <http://brew.sh>`_ and the
 Mac OS X: homebrew
 ==================
 
-homebrew is a recent addition to the package managers on Mac OSX. It is
+homebrew is a recent addition to the package managers on Mac OS X. It is
 lightweight, tries to be as minimalistic as possible and give the user
 freedom than Macports. We recommend this option if you have no preferences.
 
@@ -128,7 +128,7 @@ freedom than Macports. We recommend this option if you have no preferences.
    and follow its directions. It will ask for a few prerequisites to be
    installed, in particular
 
-  * the Xcode developer tools (compiler suite for Mac OSX) from
+  * the Xcode developer tools (compiler suite for Mac OS X) from
     `<http://developer.apple.com/downloads>`_. You will need an Apple ID to
     download. Note that if you have one already from using the App store on the
     Mac/Ipad/Iphone/... you can use that one. Downloading the command line
@@ -139,7 +139,7 @@ freedom than Macports. We recommend this option if you have no preferences.
     click on `Install`.
   * although `brew doctor` might not complain about it right away, while we're
     at it, you should also install the X11 server from the `XQuartz project
-    <http://xquartz.macosforge.org>`_ if you have Mac OSX 10.8 or higher.
+    <http://xquartz.macosforge.org>`_ if you have Mac OS X 10.8 or higher.
 
 3. Add permanently ``/usr/local/bin`` before ``/usr/bin/`` in the ``$PATH$``
    environment variable of your shell, for example by adding ::
@@ -179,8 +179,8 @@ Notes:
   though.
 
 
-Mac OSX: MacPorts
-=================
+Mac OS X: MacPorts
+==================
 
 MacPorts is a full-fledged package manager that recreates a whole Linux-like
 environment on your Mac.
@@ -193,7 +193,7 @@ In order to install Kwant using MacPorts, you have to
    In particular, as explained there, you will have to install also a
    few prerequisites, namely
 
-  * the Xcode developer tools (compiler suite for Mac OSX) from
+  * the Xcode developer tools (compiler suite for Mac OS X) from
     `<http://developer.apple.com/downloads>`_. You will need an Apple ID to
     download. Note that if you have one already from using the App store
     on the Mac/Ipad/Iphone/... you can use that one. You will also need the
@@ -202,7 +202,7 @@ In order to install Kwant using MacPorts, you have to
     select `Command Line Tools` and click on `Install`. Alternatively, you can
     also directly download the command line tools from the
     Apple developer website.
-  * if you have MacOSX 10.8 or higher, the X11 server from the
+  * if you have Mac OS X 10.8 or higher, the X11 server from the
     `XQuartz project <http://xquartz.macosforge.org>`_.
 
 2. After the installation, open a terminal and execute ::
@@ -374,7 +374,7 @@ below.
        CC=gcc-mp-4.7 LDSHARED='gcc-mp-4.7 -shared -undefined dynamic_lookup' python setup.py build
        sudo python setup.py install
 
-You might note that installing Kwant on Mac OSX is somewhat more involved than
+You might note that installing Kwant on Mac OS X is somewhat more involved than
 installing on Linux. Part of the reason is that we need to mix Fortran and C
 code in Kwant: While C code is usually compiled using Apple compilers,
 Fortran code must be compiled with the Gnu Fortran compiler (there is