Add tox -e zuul prerequisites

Manual installation of some basic packages is needed for tox -e zuul,
otherwise you'll get the following errors:

unable to execute 'x86_64-linux-gnu-gcc': No such file or directory
netifaces.c:1:20: fatal error: Python.h: No such file or directory

Change-Id: If112637e70db88dcf91b30f0d564f180633f92bf

diff --git a/README.md b/README.md
index e9c68ec1ca536dac963c2e00ff8de9f7cb873b86..3b0b9d1b298012b2e94e2ef47d8f930641681442 100644 (file)
--- a/README.md
+++ b/README.md
@@ -63,6 +63,9 @@ Adjust the jenkins jobs in `jenkins/jobs/` to your needs. You can find the full
 
 ## Basic checks
 
+Prerequisites: The following packages need to be installed for the `zuul` tox environment tests to pass:
+sudo apt-get install libxml2-dev libxslt1-dev  python-dev build-essential
+
 1. Run `tox` to run some basic syntax checks to validate the syntax of your configuration files.
 
 ## Credits