replace "Mac OS X" with "macOS"

except in older release notes where the name was actually Mac OS X.

3 files changed, 4 insertions, 4 deletions

diff --git a/doc/manual/installation/installing-binary.xml b/doc/manual/installation/installing-binary.xml
index 2a9beec98c9b..24e76eafeb18 100644
--- a/doc/manual/installation/installing-binary.xml
+++ b/doc/manual/installation/installing-binary.xml
@@ -6,7 +6,7 @@
 
 <title>Installing a Binary Distribution</title>
 
-<para>If you are using Linux or Mac OS X, the easiest way to install
+<para>If you are using Linux or macOS, the easiest way to install
 Nix is to run the following command:
 
 <screen>
@@ -39,7 +39,7 @@ behaviour.
 <!--
 <para>You can also manually download and install a binary package.
 Binary packages of the latest stable release are available for Fedora,
-Debian, Ubuntu, Mac OS X and various other systems from the <link
+Debian, Ubuntu, macOS and various other systems from the <link
 xlink:href="http://nixos.org/nix/download.html">Nix homepage</link>.
 You can also get builds of the latest development release from our
 <link
diff --git a/doc/manual/installation/multi-user.xml b/doc/manual/installation/multi-user.xml
index 49c4f723597e..a13e3c89be78 100644
--- a/doc/manual/installation/multi-user.xml
+++ b/doc/manual/installation/multi-user.xml
@@ -52,7 +52,7 @@ This creates 10 build users. There can never be more concurrent builds
 than the number of build users, so you may want to increase this if
 you expect to do many builds at the same time.</para>
 
-<para>On Mac OS X, you can create the required group and users by
+<para>On macOS, you can create the required group and users by
 running the following script:
 
 <programlisting>
diff --git a/doc/manual/installation/supported-platforms.xml b/doc/manual/installation/supported-platforms.xml
index cbe528690cd9..a468a5640637 100644
--- a/doc/manual/installation/supported-platforms.xml
+++ b/doc/manual/installation/supported-platforms.xml
@@ -12,7 +12,7 @@
 
   <listitem><para>Linux (i686, x86_64).</para></listitem>
 
-  <listitem><para>Mac OS X (x86_64).</para></listitem>
+  <listitem><para>macOS (x86_64).</para></listitem>
 
   <!--
   <listitem><para>FreeBSD (only tested on Intel).</para></listitem>