Update the readme with osx build steps

Author: edbrown23

README.md

@@ -3,42 +3,6 @@ sysadmin
 
 Like system administrators in big companies, `sysadmin` configures things
 
-Development
-===========
-
-Generally speaking, build as follows:
-
-```
-mkdir build
-cd build
-cmake ..
-make check
-make
-```
-
-`make check` runs only sysadmin's tests. If you wish to run the decibel-cpp tests, run
-`make decibel-check`.
-
-If this is your first time, you might have some dependencies which need to be installed
-first. The included `third-party-build.sh` will download, build, then install those
-dependencies. You will definitely need gcc, g++, and make at the very least in order
-to build those dependencies.
-
-Dependencies
-============
-
-sysadmin's dependencies are codified in its CMakeLists.txt files, but the key ones are
-as follows:
-    - decibel-cpp, which is included with sysadmin and built when sysadmin is built. It
-      is a C++ wrapper around libuv, and additional abstractions built with folly
-    - [libuv](https://github.com/libuv/libuv) is a C event loop library
-    - [boost](http://www.boost.org/) is boost
-    - [folly](https://github.com/facebook/folly) is a C++ library, primarily used for
-      its excellent futures code
-    - [protobufs](https://developers.google.com/protocol-buffers/), specifically proto 2,
-      provides the API to sysadmin
-    - [yaml-cpp](https://github.com/jbeder/yaml-cpp) provides YAML config file support
-
 About
 =====
 
@@ -70,3 +34,51 @@ sysadmin allows you to change the value of one or more of these keys, then `comm
 all at once, at which point the 2 hooks above are run. From a user's perspective, they need
 only know what values they want, and sysadmin takes care of the messy, system level details
 via its hooks.
+
+Dependencies
+============
+
+sysadmin's dependencies are codified in its CMakeLists.txt files, but the key ones are
+as follows:
+    - decibel-cpp, which is included with sysadmin and built when sysadmin is built. It
+      is a C++ wrapper around libuv, and additional abstractions built with folly
+    - [libuv](https://github.com/libuv/libuv) is a C event loop library
+    - [boost](http://www.boost.org/) is boost
+    - [folly](https://github.com/facebook/folly) is a C++ library, primarily used for
+      its excellent futures code
+    - [protobufs](https://developers.google.com/protocol-buffers/), specifically proto 2,
+      provides the API to sysadmin
+    - [yaml-cpp](https://github.com/jbeder/yaml-cpp) provides YAML config file support
+
+Development
+===========
+
+Generally speaking, build as follows:
+
+```
+mkdir build
+cd build
+cmake ..
+make check
+make
+```
+
+`make check` runs only sysadmin's tests. If you wish to run the decibel-cpp tests, run
+`make decibel-check`.
+
+If this is your first time, you might have some dependencies which need to be installed
+first.
+
+If you're on linux, the included `third-party-build.sh` will pull and install all
+the necessary dependencies.
+
+On macOS, `brew` is generally able to install all the necessary
+libraries, at least at the time of writing this. You'll at least need to do the following
+the first time:
+```bash
+brew install folly # Folly is the key dependency, and brings boost with it
+brew install amqp-cpp
+brew install libuv
+brew install yaml-cpp
+brew install protobuf
+```