The "make" step fails on Ubuntu 18.04.5 LTS

[skanga]

[ 54%] Linking C executable tearing
[ 54%] Built target tearing
Scanning dependencies of target docs
[ 54%] Generating HTML documentation
[ 54%] Built target docs
Scanning dependencies of target opengl_viewer
[ 54%] Building CXX object externals/opengl_viewer/projects/opengl_viewer/CMakeFiles/opengl_viewer.dir/src/bounding_box.cpp.o
In file included from /home/skanga/Downloads/multicopter_design/externals/opengl_viewer/projects/opengl_viewer/src/bounding_box.cpp:17:0:
/home/skanga/Downloads/multicopter_design/externals/opengl_viewer/projects/opengl_viewer/include/bounding_box.h:20:10: fatal error: Eigen/Dense: No such file or directory
#include "Eigen/Dense"
^~~~~~~~~~~~~
compilation terminated.
externals/opengl_viewer/projects/opengl_viewer/CMakeFiles/opengl_viewer.dir/build.make:62: recipe for target 'externals/opengl_viewer/projects/opengl_viewer/CMakeFiles/opengl_viewer.dir/src/bounding_box.cpp.o' failed
make[2]: *** [externals/opengl_viewer/projects/opengl_viewer/CMakeFiles/opengl_viewer.dir/src/bounding_box.cpp.o] Error 1
CMakeFiles/Makefile2:1385: recipe for target 'externals/opengl_viewer/projects/opengl_viewer/CMakeFiles/opengl_viewer.dir/all' failed
make[1]: *** [externals/opengl_viewer/projects/opengl_viewer/CMakeFiles/opengl_viewer.dir/all] Error 2
Makefile:151: recipe for target 'all' failed
make: *** [all] Error 2

[skanga]

OK. So if I change from
#include "Eigen/Dense"
to
#include <eigen3/Eigen/Dense>

in all of the 15-20 files that use it then it seems to go through.

Is it possible to #define this in some way for this OS?

[scientistbala]

Hi sir,
I have the same issue. can u help me to fix it?

Thanks in advance

[Tconcept]

@scientistbala , fix suggested by skanga works. just open the header file mentioned in the error message and replace "Eigen/Dense" with "eigen3/Eigen/Dense".

[scientistbala]

@scientistbala , fix suggested by skanga works. just open the header file mentioned in the error message and replace "Eigen/Dense" with "eigen3/Eigen/Dense".

hi sir,
Thanks for your reply, where exactly or which file i have to open and change this.

Thanks in advance

[Tconcept]

Its mentioned in the error msg itself. for example, for the error in the first comment (/home/skanga/Downloads/multicopter_design/externals/opengl_viewer/projects/opengl_viewer/include/bounding_box.h)

[skanga]

@scientistbala There are a LOT of files that have this include.

Running a build and fixing each file that has the error will get PAINFUL but it will work.

Instead, I would recommend doing a "find" to locate all files in tree with this string and then automating the replacement.

[skanga]

These are all the files you need to fix

./projects/copter_simulation/include/design_problem.h
./projects/copter_simulation/include/tri_mesh.h
./projects/copter_simulation/include/controller.h
./projects/copter_simulation/include/inertial_sensor.h
./projects/copter_simulation/include/nlopt_function.h
./projects/copter_simulation/include/rigid_body.h
./projects/copter_simulation/include/copter_designer.h
./projects/copter_simulation/include/rotor.h
./externals/opengl_viewer/projects/opengl_viewer/include/option.h
./externals/opengl_viewer/projects/opengl_viewer/include/opengl_shape.h
./externals/opengl_viewer/projects/opengl_viewer/include/image.h
./externals/opengl_viewer/projects/opengl_viewer/include/bounding_box.h
./externals/opengl_viewer/projects/opengl_viewer/include/opengl_light.h
./externals/opengl_viewer/projects/opengl_viewer/include/shader_program.h
./externals/opengl_viewer/projects/opengl_viewer/include/geometry.h
./externals/opengl_viewer/projects/opengl_viewer/include/animator.h
./externals/opengl_viewer/projects/opengl_viewer/include/sampling_animator.h

[scientistbala]

Thank u, sir

It worked.