added macOS instructions

INSTALL.rst

@@ -4,6 +4,7 @@ Installation
 Instructions are available for the following operating systems:
 
 * `Linux/BSD <#linuxbsd>`_
+* `macOS <#macos>`_
 * `Windows <#windows>`_
 
 Linux/BSD
@@ -85,6 +86,27 @@ Other Linux/UNIX-based systems
 -------------------------------
 If you fit this category, you probably know what you need to build ``uirc``.
 
+macOS
+======
+
+To build ``uirc`` on macOS, make sure `brew <https://brew.sh>`_ and the Xcode Command Line tools (run ``xcode-select --install`` to make sure) are installed, then follow the instructions below.
+
+.. code:: bash
+
+  % brew install curl wget
+  % git clone https://github.com/brysonsteck/uirc && cd uirc
+
+You will also need to uncomment the INCLUDE_PREFIX line at the top of the `config.mk <config.mk>`_ file to make sure that the stb library is downloaded correctly.
+
+.. code:: bash
+
+  # in macOS, you must install the 'stb' library manually from GitHub. do this with:
+  % make stb
+  # build uirc with:
+  % make
+  # or, if you want to install globally, use:
+  % make install
+
 Windows
 ========
 

Makefile

@@ -26,6 +26,6 @@ stb:
 	@echo "Press ENTER to manually install the stb headers needed instead. Otherwise, quit with ^C"
 	@read
 	mkdir -p ${INCLUDE_PREFIX}/stb
-	wget https://raw.githubusercontent.com/nothings/stb/master/stb_image.h -P /usr/include/stb/
+	wget https://raw.githubusercontent.com/nothings/stb/master/stb_image.h -P ${INCLUDE_PREFIX}/stb
 
 .PHONY: uirc install stb

config.mk

@@ -2,6 +2,9 @@
 PREFIX = /usr/local/bin
 LIB_PREFIX = ${PREFIX}/lib
 INCLUDE_PREFIX = /usr/include
+# comment the line above and uncomment the following line
+# if you are building on macOS, otherwise it is optional
+#INCLUDE_PREFIX = /usr/local/include
 
 # manual install location
 MANPREFIX = ${PREFIX}/share/man