Ubantu14.04lts system installs G2O and runs G2o_viewer

Installation step 1. Download

Use the following command to download

git clone https://github.com/RainerKuemmerle/g2o/

Note that after downloading and then g2o the folder under Git log, I find that my current version is
Https://github.com/RainerKuemmerle/g2o/tree/deafc01ee8315b9405351fb145238c5d62f82dc7 2. Installation

Note that if you want to run G2o_viewer, skip directly to 3.2 and follow the steps to install ... Do not run G2o_viewer and follow the Readme.txt installation under the G2o folder.
Where these dependencies need to be added in front of sudo apt-get install
-Libeigen3-dev
-Libsuitesparse-dev
-Libqt4-dev
-Qt4-qmake
-Libqglviewer-qt4-dev

Note
Installing Libqglviewer

sudo apt-get Install-libqglviewer-qt4-dev

will prompt for incorrect name, workaround

sudo apt-get install Libqglviewer-dev

If not installed Libqglviewer will appear
G2o_viewer is not installed on this issue. Is that the executable file cannot be found in the Bin folder G2o_viewer 3. Operational and inevitable problems

CD to Bin folder

./g2o_viewer

Segmentation Fault (core dump) will appear
The reason is that QT4 is used under Ubuntu 14.04, and the current G2O version uses QT5, so g2o_viewer links the Qt two version of the dynamic link library.
Workaround:
Reference
Http://www.cnblogs.com/JingeTU/p/6390924.html
and http://www.cnblogs.com/gaoxiang12/p/4770813.html
Comments under Slamstudy.
The steps are as follows: 3.1 uninstalling G2o

RM-RF build and bin directly without make install

RM-RF Build
Rm-rf Bin

If make has been install,

RM-RF/USR/LOCAL/INCLUDE/G2O
rm-rf/usr/local/lib/libg2o*

3.2 Switch to a valid version and reload G2o

This version is valid.
8ba8a03f7863e1011e3270bb73c8ed9383ccc2a2
.. Therefore, the installation can run G2o_viewer all commands as follows:
Switch to the G2O directory

git clone https://github.com/RainerKuemmerle/g2o/
git log |grep 8ba8a*
git checkout 8BA8A03F7863E1011E3270BB73C8ED9383CCC2A2
sudo apt-get install libqt4-dev
sudo apt-get install qt4-qmake
sudo apt-get install Libqglviewer-dev
mkdir build
CD build
cmake. /
Make-j8

(3) Running G2o_viewer
Switch to the Bin folder

./g2o_viewer

The effect is as follows