SLAM14讲中Sophus包的安装问题

        SLAM14中，useSophus.cpp工程编译中报错：

CMake Error at CMakeLists.txt:5 (find_package):
    By not providing "FindSophus.cmake" in CMAKE_MODULE_PATH this project has
asked CMake to find a package configuration file provided by "Sophus", but
CMake did not find one.
    Could not find a package configuration file provided by "Sophus" with any
of the following names:

        报错原因：makelist中找不到Sophus头文件。我们分两步处理：

1、下载Sophus包，并编译、安装

        进入源码目录，编译，安装。

cd slambook2/3rdparty/Sophus
mkdir build
cd build
cmake ..
make
sudo make install

2、在CMakeLists.txt文件中添加Sophus_INCLUDE_DIRS变量

        观看错误信息，其实就是找不到Sophus库和头文件的内容：

set(Sophus_INCLUDE_DIRS "放置你的Sophus头文件文件夹路径")
set(Sophus_LIBS "放置你的Sophus库文件的文件夹路径，指明相应的库文件")

        比如，我的是这样的：

set(Sophus_INCLUDE_DIRS "/usr/local/include/sophus")
# set(Sophus_LIBS "/usr/local/lib/libSophus.so")
include_directories(
${Sophus_INCLUDE_DIRS}
)

        然后再将你的执行文件链接上Sophus库文件。这样的话，上述编译错误应该就可以消失了。