/usr/include/ is in libwfmath-1.0-dev 1.0.2+dfsg1-0.3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/wfmath-1.0/
/usr/include/wfmath-1.0/wfmath/
/usr/include/wfmath-1.0/wfmath/randgen.h
/usr/include/wfmath-1.0/wfmath/rotmatrix.h
/usr/include/wfmath-1.0/wfmath/intersect_decls.h
/usr/include/wfmath-1.0/wfmath/error.h
/usr/include/wfmath-1.0/wfmath/rotbox_funcs.h
/usr/include/wfmath-1.0/wfmath/segment_funcs.h
/usr/include/wfmath-1.0/wfmath/shuffle.h
/usr/include/wfmath-1.0/wfmath/miniball_funcs.h
/usr/include/wfmath-1.0/wfmath/axisbox.h
/usr/include/wfmath-1.0/wfmath/line_funcs.h
/usr/include/wfmath-1.0/wfmath/wfmath.h
/usr/include/wfmath-1.0/wfmath/rotmatrix_funcs.h
/usr/include/wfmath-1.0/wfmath/stream.h
/usr/include/wfmath-1.0/wfmath/vector.h
/usr/include/wfmath-1.0/wfmath/axisbox_funcs.h
/usr/include/wfmath-1.0/wfmath/polygon_intersect.h
/usr/include/wfmath-1.0/wfmath/quaternion.h
/usr/include/wfmath-1.0/wfmath/vector_funcs.h
/usr/include/wfmath-1.0/wfmath/MersenneTwister.h
/usr/include/wfmath-1.0/wfmath/int_to_string.h
/usr/include/wfmath-1.0/wfmath/ball_funcs.h
/usr/include/wfmath-1.0/wfmath/segment.h
/usr/include/wfmath-1.0/wfmath/wrapped_array.h
/usr/include/wfmath-1.0/wfmath/polygon.h
/usr/include/wfmath-1.0/wfmath/probability.h
/usr/include/wfmath-1.0/wfmath/polygon_funcs.h
/usr/include/wfmath-1.0/wfmath/rotbox.h
/usr/include/wfmath-1.0/wfmath/point.h
/usr/include/wfmath-1.0/wfmath/zero.h
/usr/include/wfmath-1.0/wfmath/point_funcs.h
/usr/include/wfmath-1.0/wfmath/timestamp.h
/usr/include/wfmath-1.0/wfmath/intersect.h
/usr/include/wfmath-1.0/wfmath/const.h
/usr/include/wfmath-1.0/wfmath/line.h
/usr/include/wfmath-1.0/wfmath/miniball.h
/usr/include/wfmath-1.0/wfmath/ball.h
/usr/include/wfmath-1.0/wfmath/atlasconv.h