How to include in CMake the files on which Eigen depends? -

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i working on c project downloaded internet. trying add functions in eigen used linear algebra.

to end, added following lines cmakelists.txt :

pkg_check_modules(eigen3 required eigen3) include_directories(${eigen3_include_dirs}) link_directories(${eigen3_library_dirs}) add_executable(main main.c) target_link_libraries(main ${eigen3_libraries})

and no errors when running cmake . , make

the issue when try include <eigen/dense> in 1 of c functions, following error when try make:

/usr/include/eigen3/eigen/core:28:19: fatal error: complex: no such file or directory  #include <complex>

eigen/dense includes eigen/core , eigen/core includes <complex> think it's not looking in correct directory find complex... how make there?

eigen in c++ library, while application source c file (main.c). since has .c extension, cmake threats c source , use c compiler, doesn't know c++ standard library (<complex>). rename main.c main.cpp.


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