installation-instructions.md

@@ -3,7 +3,30 @@
 Note that although graph-tool is a Python library, it is implemented in C++, and thus has C++ dependencies such as [Boost](http://www.boost.org/), [CGAL](http://www.cgal.org/) and [expat](http://expat.sourceforge.net/), which are not instalable via Python-only package management systems such as [pip](http://www.pip-installer.org/).
 
 
-# Pre-compiled Packages
+# GNU/Linux
+
+## Arch
+
+[Packages for Arch](https://aur.archlinux.org/packages/python-graph-tool/) are available in the Arch User Repository. You can install it with yaourt:
+
+```
+yaourt -S python2-graph-tool
+```
+or
+```
+yaourt -S python-graph-tool
+```
+depending on the python version.
+
+## Gentoo
+
+An ebuild for graph-tool is included in the default [Gentoo](https://www.gentoo.org/) repository. Just do
+
+```
+emerge graph-tool
+```
+to install it.
+
 ## Debian & Ubuntu
 
 For [Debian](http://www.debian.org/), add the following lines to your `/etc/apt/sources.list`,
@@ -53,31 +76,10 @@ sub   4096R/1A7ECE03 2013-10-17 [expires: 2018-10-16]
 sub   4096R/23F08CAF 2013-10-17 [expires: 2018-10-16]
 ```
 
-## Arch
-
-[Packages for Arch](https://aur.archlinux.org/packages/python-graph-tool/) are available in the Arch User Repository. You can install it with yaourt:
-
-```
-yaourt -S python2-graph-tool
-```
-or
-```
-yaourt -S python-graph-tool
-```
-depending on the python version.
-
-## Gentoo
-
-An ebuild for graph-tool is included in the default [Gentoo](https://www.gentoo.org/) repository. Just do
-
-```
-emerge graph-tool
-```
-to install it.
-
 <a name="macos"></a>
-## MacOS X
-### Macports
+
+# MacOS X
+## Macports
 
 A portfile is available for installation in MacOS X systems with [Macports](http://www.macports.org/). It is included in the [standard macports list](http://www.macports.org/ports.php?by=name&substr=graph-tool). Just run the following command to install it:
 
@@ -85,7 +87,7 @@ A portfile is available for installation in MacOS X systems with [Macports](http
 port install py-graph-tool
 ```
 
-### Homebrew
+## Homebrew
 
 With [Homebrew](http://brew.sh/) the installation is also straightforward, since a formula for it is included in the "science" list:
 ```