Update installation instructions

nteract/nteract#980

Author: lgeiger

README.md

@@ -55,13 +55,19 @@ The wonder of binaries begins.
 To set up `zmq-prebuilt` for development, fork this repository and
 clone your fork to your system. Be sure you have [`git-lfs`](https://git-lfs.github.com/) installed.
 
-**Prerequisites for Linux and OS X**
+**Prerequisites for Linux**
+- `python` (`v2.7` recommended, `v3.x.x` is not supported)
+- `make`
+- `wget`
+- A proper C/C++ compiler toolchain, like [GCC](https://gcc.gnu.org/)
 
-If you are running on Linux or OS X, you will need to have `automake`,
-`autoconf`, `pkg-config`, `wget`, `libtool` and Python 2.7 (`v3.x.x` is not supported) installed. For Linux, use your distribution's
-package manager to install. On OS X, these can be installed using
-[Homebrew](http://brew.sh) and using the Homebrew command `brew install`
-command. For example, install `wget` with `brew install wget`.
+Use your distribution's package manager to install.
+
+**Prerequisites for macOS**
+
+- `python` (`v2.7` recommended, `v3.x.x` is not supported): already installed on Mac OS X
+- `Xcode Command Line Tools`: Can be installed with `xcode-select --install`
+- `wget`: Can be installed via [Homebrew](http://brew.sh) with `brew install wget`
 
 **Prerequisites for Windows**