I stumbled little bit but i found a way to make it work.
I share it for those who needs this.
Here it is my httpd-app.conf for Redmine 2.5 with bitnami stack;
<IfVersion < 2.3 >
Allow from all
<IfVersion >= 2.3>
Require all granted
Also you need to change httpd-prefix;
These are the setting that works for me. Hope it helps everybody.