Added software installation instructions for CentOS.
@@ -251,7 +251,57 @@ languages (Go, PHP, and Python) that you want to support.
### Installing Required Software on CentOS Systems
-**TBD**
+Before configuring and compiling Unit on CentOS systems, you must install the
+required build tools plus the library files for each of the available
+languages (Go, PHP, and Python) that you want to support.
+
+ 1. Install the build tools. Note that they might require more than
+ 40&nbsp;MB of disk space.
+
+ ```
+ # yum install gcc make
+ ...
+ Total download size: 18 M
+ Installed size: 42 M
+ Is this ok [y/d/N]: y
+ ...
+ ```
+
+ 2. If you are supporting Go, install the `golang` package. The required
+ additional disk space might be about 230&nbsp;MB.
+
+ ```
+ # yum install golang
+ ...
+ Total download size: 44 M
+ Installed size: 231 M
+ Is this ok [y/d/N]: y
+ ...
+ ```
+
+ 3. If you are supporting PHP, install the `php-devel` and `php-embedded`
+ packages. The required additional disk space might be around 20&nbsp;MB.
+
+ ```
+ # yum install php-devel php-embedded
+ ...
+ Total download size: 5.2 M
+ Installed size: 21 M
+ Is this ok [y/d/N]: y
+ ...
+ ```
+
+ 4. If you are supporting Python, install the `python-devel` package. The
+ required additional disk space might be around 1&nbsp;MB.
+
+ ```
+ # yum install python-devel
+ ...
+ Total download size: 393 k
+ Installed size: 1.0 M
+ Is this ok [y/d/N]: y
+ ...
+ ```
### Configuring the Unit Source
