在安装完该g2o之后 运行一些程序 如高翔的ch6 代码会出现如下错误：
CMake Warning at CMakeLists.txt:10 (FIND_PACKAGE):
By not providing "FindG2O.cmake" in CMAKE_MODULE_PATH this project has
asked CMake to find a package configuration file provided by "G2O", but
CMake did not find one.
Could not find a package configuration file provided by "G2O" with any of
the following names:
G2OConfig.cmake
g2o-config.cmake
Add the installation prefix of "G2O" to CMAKE_PREFIX_PATH or set "G2O_DIR"
to a directory containing one of the above files. If "G2O" provides a
separate development package or SDK, be sure it has been installed.解决方式很简单：
主要是CMakeLists.txt上要修改几行代码
本来是这样的就会报错：
list( APPEND CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake )
find_package(G2O REQUIRED)
include_directories(
${G2O_INCLUDE_DIRS} )修改为：
list( APPEND CMAKE_MODULE_PATH /home/×××/g2o/cmake_modules )
set(G2O_ROOT /usr/local/include/g2o)
find_package(G2O REQUIRED)
include_directories(
${G2O_INCLUDE_DIRS} )然后再cmake便不会出现问题了。
主要原因就是原始代码中的下面一句代码：
${PROJECT_SOURCE_DIR}/cmake是ch6文件夹中原来就包含的cmake文件夹中FindG2O.cmake在你的文件夹不存在，只要把list那行路径改到FindG2O.cmake存在的文件夹就行。