一、编译

1、去github官网下载g2o,网址g2o

2、先安装依赖项

sudo apt-get install cmake libeigen3-dev libsuitesparse-dev qtdeclarative5-dev qt5-qmake libqglviewer-dev

3、编译安装lapack

我安装的的是clapack，是lapack的C语言版本。怎么安装有很多博客已经写好了。

3、解压第一步下载的文件

mkdir build
cd build
cmake -D BUILD_CSPARSE=TRUE -D LAPACK_INCLUDE_DIR=/usr/local/include -D LAPACK_LIBRARIES_DIR=/usr/local/lib ..
make
sudo make install #安装
sudo ldconfig     #更新

其中，LAPACK_INCLUDE_DIR是第二步中lapack头文件的目录；LAPACK_LIBRARIES_DIR是第二步中lapack的库目录。

二、使用

1、参见博客： G2O非线性优化 、 g2o小记

2、附上一个自己的CMakeLists.txt

首先将g2o项目中的cmake_module复制到你的项目中

cmake_minimum_required(VERSION 2.8)
project(testProjest)set(CMAKE_CXX_COMPILER g++)
set(CMAKE_BUILD_TYPE "RELEASE")
set(CMAKE_CXX_FLAGS "-std=c++11")list( APPEND CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake_modules )ffind_package(Cholmod)set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ../run)	#这一句指定可执行文件的位置include_directories(${CHOLMOD_INCLUDE_DIR})file(GLOB CURRENT_HEADERS  include/*.* include/lib/*.h)
file(GLOB CURRENT_SOURCES  source/*.*)
source_group("Include" FILES ${CURRENT_HEADERS})
source_group("Source" FILES ${CURRENT_SOURCES})set(G2O_LIBS g2o_cli g2o_ext_freeglut_minimal g2o_simulator g2o_solver_slam2d_linear g2o_types_icp g2o_types_slam2d g2o_core g2o_interface g2o_solver_csparse g2o_solver_structure_only g2o_types_sba g2o_types_slam3d g2o_csparse_extension g2o_opengl_helper g2o_solver_dense g2o_stuff g2o_types_sclam2d g2o_parser g2o_solver_pcg g2o_types_data g2o_types_sim3 cxsparse )add_executable(${PROJECT_NAME} ${CURRENT_HEADERS} ${CURRENT_SOURCES})target_link_libraries(${PROJECT_NAME} ${G2O_LIBS} ${CHOLMOD_LIBRARIES})