Update INSTALL instructions with new macOS version

INSTALL.md

@@ -4,18 +4,18 @@
 * [Get the source code](#get-the-source-code)
 * [Dependencies](#dependencies)
   * [Windows dependencies](#windows-dependencies)
-  * [Mac OS X dependencies](#mac-os-x-dependencies)
+  * [macOS dependencies](#macos-dependencies)
   * [Linux dependencies](#linux-dependencies)
 * [Compiling](#compiling)
   * [Windows details](#windows-details)
-  * [Mac OS X details](#mac-os-x-details)
+  * [macOS details](#macos-details)
     * [Issues with Retina displays](#issues-with-retina-displays)
   * [Linux details](#linux-details)
 * [Using shared third party libraries](#using-shared-third-party-libraries)
   * [Linux issues](#linux-issues)
 * [Building Skia dependency](#building-skia-dependency)
   * [Skia on Windows](#skia-on-windows)
-  * [Skia on Mac OS X](#skia-on-mac-os-x)
+  * [Skia on macOS](#skia-on-macos)
 
 # Platforms
 
@@ -23,7 +23,7 @@ You should be able to compile Aseprite successfully on the following
 platforms:
 
 * Windows 10 + VS2015 Community Edition + Windows 10 SDK
-* Mac OS X 10.11.4 El Capitan + Xcode 7.3 + OS X 10.11 SDK + Skia (without GPU)
+* macOS 10.12.1 Sierra + Xcode 8.0 + macOS 10.12 SDK + Skia
 * Linux + gcc 4.8 with some C++11 support
 
 # Get the source code
@@ -62,7 +62,7 @@ Aseprite can be compiled with two different back-ends:
    removed in future versions. All new development is being done in
    the new Skia back-end.
 
-2. Skia back-end (Windows, Mac OS X): You will need a compiled version
+2. Skia back-end (Windows, macOS): You will need a compiled version
    of the Skia library. Please check the details about
    [how to build Skia](#building-skia-dependency) on your platform.
 
@@ -83,12 +83,12 @@ After that you have to choose the back-end:
    [Windows details](#windows-details) section to know how to call
    `cmake` correctly.
 
-## Mac OS X dependencies
+## macOS dependencies
 
-On OS X you will need Mac OS X 10.11 SDK and Xcode 7.3 (maybe older
-versions might work).
+On macOS you will need macOS 10.12 SDK and Xcode 8.0 (older versions
+might work).
 
-Also, you must compile [Skia](#skia-on-mac-os-x) before starting with
+Also, you must compile [Skia](#skia-on-macos) before starting with
 the [compilation](#compiling).
 
 ## Linux dependencies
@@ -121,7 +121,7 @@ The `libxcursor-dev` package is needed to
 
    Here `cmake` needs different options depending on your
    platform. You must check the details for
-   [Windows](#windows-details), [OS X](#mac-os-x-details), and
+   [Windows](#windows-details), [macOS](#macos-details), and
    [Linux](#linux-details). Some `cmake` options can be modified using tools like
    [`ccmake`](https://cmake.org/cmake/help/latest/manual/ccmake.1.html)
    or [`cmake-gui`](https://cmake.org/cmake/help/latest/manual/cmake-gui.1.html).
@@ -150,9 +150,9 @@ with the following arguments:
 In this case, `C:\deps\skia` is the directory where Skia was compiled
 as described in [Skia on Windows](#skia-on-windows) section.
 
-## Mac OS X details
+## macOS details
 
-After [compiling Skia](#skia-on-mac-os-x), you should run `cmake` with
+After [compiling Skia](#skia-on-macos), you should run `cmake` with
 the following parameters and then `ninja`:
 
     cd aseprite
@@ -161,7 +161,7 @@ the following parameters and then `ninja`:
     cmake \
       -DCMAKE_OSX_ARCHITECTURES=x86_64 \
       -DCMAKE_OSX_DEPLOYMENT_TARGET=10.7 \
-      -DCMAKE_OSX_SYSROOT=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk \
+      -DCMAKE_OSX_SYSROOT=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.12.sdk \
       -DUSE_ALLEG4_BACKEND=OFF \
       -DUSE_SKIA_BACKEND=ON \
       -DSKIA_DIR=$HOME/deps/skia \
@@ -171,7 +171,7 @@ the following parameters and then `ninja`:
     ninja aseprite
 
 In this case, `$HOME/deps/skia` is the directory where Skia was
-compiled as described in [Skia on Mac OS X](#skia-on-mac-os-x) section.
+compiled as described in [Skia on macOS](#skia-on-macos) section.
 
 ### Issues with Retina displays
 
@@ -220,7 +220,7 @@ known issues solved in
 # Building Skia dependency
 
 When you compile Aseprite with [Skia](https://skia.org) as back-end on
-Windows or OS X, you need to compile a specific version of Skia. In
+Windows or macOS, you need to compile a specific version of Skia. In
 the following sections you will find straightforward steps to compile
 Skia.
 
@@ -260,7 +260,7 @@ lot of packages, please wait and re-run the same command in case it fails.)
 More information about these steps in the
 [official Skia documentation](https://skia.org/user/quick/windows).
 
-## Skia on Mac OS X
+## Skia on macOS
 
 These steps will create a `deps` folder in your home directory with a
 couple of subdirectories needed to build Skia (you can change the
@@ -280,7 +280,7 @@ several minutes to finish:
 After this you should have all Skia libraries compiled.  When you
 [compile Aseprite](#compiling), remember to add
 `-DSKIA_DIR=$HOME/deps/skia` parameter to your `cmake` call as
-described in the [Mac OS X details](#mac-os-x-details) section.
+described in the [macOS details](#macos-details) section.
 
 More information about these steps in the
 [official Skia documentation](https://skia.org/user/quick/macos).