Hi Gajan,

>
> I am getting the following warnings when I import a ROS package to Eclipse.
> ----
> Invalid project path: Include path not found
> (/opt/ros/cturtle/stacks/common/actionlib/msg/cpp)
> ----
> the cpp is actually inside [msg_gen] not [msg].
> Is there a way to avoid these warnings.

I also experience that problem and reported the issue which originates 
from having the non-existant exports in the manifest.xml some time ago 
[1], and also ticketed the separate stacks that I found having these 
errors in their manifests. There was also a short discussion on the 
mailing list recently [2]. Most (if not all) stacks I found should be 
fixed by now, but I don't know when they will be released and in which 
distribution (will there still be patch releases for cturtle?).

A quick fix could be to edit the manifest.xml of all affected stacks in 
your installation to remove the offending part of the cflags.

Best,
Armin




[1] https://code.ros.org/trac/ros/ticket/3217
[2] 
http://ros-users.122217.n3.nabble.com/Please-remove-references-to-msg-cpp-and-srv-cpp-from-package-manifests-td2168967.html#a2170278

-- 
Armin Hornung
Humanoid Robots Lab, Albert-Ludwigs-Universität Freiburg
Contact: http://www.informatik.uni-freiburg.de/~hornunga