doc: documented the missing build dependencies as per #126.

README.markdown

@@ -50,6 +50,15 @@ make
 
 at the top of the bundle source tree.
 
+Please note that you may need to install some extra dependencies, like `perl`, `dos2unix` and
+the Perl CPAN mdoule `Markdown::Pod`. On Fedora 22, for example, installing the dependencies
+is as simple as running the following commands:
+
+```bash
+sudo dnf install perl dos2unix
+sudo cpan Markdown::Pod
+```
+
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