put virtualenv activation during build in comment. That means that for the moment the build machine must be provisionned beforehand, or ansible must be available globally
# The Fastcgi Apache module configuration file is being
# managed by Puppet and changes will be overwritten.
<IfModule mod_fastcgi.c>
AddHandler fastcgi-script .fcgi
FastCgiIpcDir "<%= @fastcgi_lib_path %>"
</IfModule>