ch6 安装完ceres库之后运行自带示例程序正常，但是运行ceres_curve_fitting会出现错误

[rib12316]

CMake Error at /usr/local/lib/cmake/Ceres/CeresConfig.cmake:89 (else):
Flow control statements are not properly nested.
Call Stack (most recent call first):
CMakeLists.txt:11 (find_package)

CMake Error at CMakeLists.txt:11 (find_package):
find_package Error reading CMake code from
"/usr/local/lib/cmake/Ceres/CeresConfig.cmake".

[rib12316]

这个是因为我cmake版本太高了，重新下一个就好