compile pcl 1.8.1 from source code on ubuntu 16.04

1.  clone pcl 1.8.1 git clone https://github.com/PointCloudLibrary/pcl.git 2. install eigen sudo apt-get install libeigen3-dev 3. compile flann1.9.1 from github https://github.com/mariusmuja/flann 4.

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