Eigen: Eigen/Core: No such file or directory
## Eigen/Core: No such file or directory
```sh
[ 25%] Building CXX object CMakeFiles/useSophus.dir/useSophus.cpp.o
/home/yubao/data/project/slambook2/useSophus/useSophus.cpp:3:10: fatal error: Eigen/Core: No such file or directory
#include
^~~~~~~~~~~~
compilation terminated.
CMakeFiles/useSophus.dir/build.make:62: recipe for target 'CMakeFiles/useSophus.dir/useSophus.cpp.o' failed
make[2]: *** [CMakeFiles/useSophus.dir/useSophus.cpp.o] Error 1
CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/useSophus.dir/all' failed
make[1]: *** [CMakeFiles/useSophus.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2
➜ build git:(master) ✗
```
Solution:
```cpp
#include
```
Refer: https://github.com/wjakob/nanogui/issues/356
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