Setting up ORB SLAM2 on Ubuntu

1a) Install opencv with eigen option enabled  

Before make ensure eigen is set to ON  - can do this using cmake-gui (search for Eigen and specify directory)

can clone eigen from here:  http://eigen.tuxfamily.org/index.php?title=Main_Page

e.g. hg clone https://bitbucket.org/eigen/eigen/


1b) then following these instructions for compiling OpenCV

https://www.pyimagesearch.com/2018/05/28/ubuntu-18-04-how-to-install-opencv/


2) Then install Orb Slam 2
https://github.com/raulmur/ORB_SLAM2

- if issue with Eigen director then can ty this:   sudo apt-get install libeigen3-dev
- if issues with usleep missing in .cc files then add this in each error file:

   #include

source:    https://github.com/raulmur/ORB_SLAM2/issues/254