/usr/include/gecode/float/ is in libgecode-dev 4.2.1-2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/gecode/float/arithmetic/
/usr/include/gecode/float/arithmetic.hh
/usr/include/gecode/float/arithmetic/div.hpp
/usr/include/gecode/float/arithmetic/min-max-channel.hpp
/usr/include/gecode/float/arithmetic/mult.hpp
/usr/include/gecode/float/arithmetic/pow-nroot.hpp
/usr/include/gecode/float/arithmetic/sqr-sqrt-abs.hpp
/usr/include/gecode/float/array-traits.hpp
/usr/include/gecode/float/array.hpp
/usr/include/gecode/float/branch/
/usr/include/gecode/float/branch.hh
/usr/include/gecode/float/branch/activity.hpp
/usr/include/gecode/float/branch/afc.hpp
/usr/include/gecode/float/branch/assign.hpp
/usr/include/gecode/float/branch/merit.hpp
/usr/include/gecode/float/branch/traits.hpp
/usr/include/gecode/float/branch/val-commit.hpp
/usr/include/gecode/float/branch/val-sel.hpp
/usr/include/gecode/float/branch/val.hpp
/usr/include/gecode/float/branch/var.hpp
/usr/include/gecode/float/exception.hpp
/usr/include/gecode/float/limits.hpp
/usr/include/gecode/float/linear/
/usr/include/gecode/float/linear.hh
/usr/include/gecode/float/linear/nary.hpp
/usr/include/gecode/float/nextafter.hpp
/usr/include/gecode/float/num.hpp
/usr/include/gecode/float/rel/
/usr/include/gecode/float/rel.hh
/usr/include/gecode/float/rel/eq.hpp
/usr/include/gecode/float/rel/lq-le.hpp
/usr/include/gecode/float/rel/nq.hpp
/usr/include/gecode/float/rounding.hpp
/usr/include/gecode/float/transcendental/
/usr/include/gecode/float/transcendental.hh
/usr/include/gecode/float/transcendental/exp-log.hpp
/usr/include/gecode/float/trigonometric/
/usr/include/gecode/float/trigonometric.hh
/usr/include/gecode/float/trigonometric/asinacos.hpp
/usr/include/gecode/float/trigonometric/sincos.hpp
/usr/include/gecode/float/trigonometric/tanatan.hpp
/usr/include/gecode/float/val.hpp
/usr/include/gecode/float/var/
/usr/include/gecode/float/var-imp/
/usr/include/gecode/float/var-imp.hpp
/usr/include/gecode/float/var-imp/delta.hpp
/usr/include/gecode/float/var-imp/float.hpp
/usr/include/gecode/float/var/float.hpp
/usr/include/gecode/float/var/print.hpp
/usr/include/gecode/float/view/
/usr/include/gecode/float/view.hpp
/usr/include/gecode/float/view/float.hpp
/usr/include/gecode/float/view/minus.hpp
/usr/include/gecode/float/view/offset.hpp
/usr/include/gecode/float/view/print.hpp
/usr/include/gecode/float/view/rel-test.hpp
/usr/include/gecode/float/view/scale.hpp