/usr/include/feel/ is in libfeel++-dev 1:0.99.0-final.1-1.
This file is owned by root:root, with mode 0o755.
There are a lot of files here (986 total). We're only showing the immediate contents of /usr/include/feel.
/usr/include/feel
..
/usr/include/feel/Eigen/
/usr/include/feel/feel.hpp
/usr/include/feel/feelalg/
/usr/include/feel/feelconfig.h
/usr/include/feel/feelcore/
/usr/include/feel/feelcrb/
/usr/include/feel/feeldiscr/
/usr/include/feel/feelfilters/
/usr/include/feel/feelinfo.h
/usr/include/feel/feelmaterial/
/usr/include/feel/feelmesh/
/usr/include/feel/feelopt/
/usr/include/feel/feelpde/
/usr/include/feel/feelpoly/
/usr/include/feel/feelpython/
/usr/include/feel/feelsystem/
/usr/include/feel/feeltiming/
/usr/include/feel/feelts/
/usr/include/feel/feelvf/
/usr/include/feel/gflags/
/usr/include/feel/ginac/
/usr/include/feel/glog/
/usr/include/feel/gmsh/
/usr/include/feel/nlopt/
/usr/include/feel/options.hpp
/usr/include/feel/signature_of_eigen3_matrix_library