/usr/share/octave/site/ is in octave-nlopt 2.4.2+dfsg-2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/octave/site/m/
/usr/share/octave/site/m/nlopt/
/usr/share/octave/site/m/nlopt/NLOPT_AUGLAG.m
/usr/share/octave/site/m/nlopt/NLOPT_AUGLAG_EQ.m
/usr/share/octave/site/m/nlopt/NLOPT_GD_MLSL.m
/usr/share/octave/site/m/nlopt/NLOPT_GD_MLSL_LDS.m
/usr/share/octave/site/m/nlopt/NLOPT_GD_STOGO.m
/usr/share/octave/site/m/nlopt/NLOPT_GD_STOGO_RAND.m
/usr/share/octave/site/m/nlopt/NLOPT_GN_CRS2_LM.m
/usr/share/octave/site/m/nlopt/NLOPT_GN_DIRECT.m
/usr/share/octave/site/m/nlopt/NLOPT_GN_DIRECT_L.m
/usr/share/octave/site/m/nlopt/NLOPT_GN_DIRECT_L_NOSCAL.m
/usr/share/octave/site/m/nlopt/NLOPT_GN_DIRECT_L_RAND.m
/usr/share/octave/site/m/nlopt/NLOPT_GN_DIRECT_L_RAND_NOSCAL.m
/usr/share/octave/site/m/nlopt/NLOPT_GN_DIRECT_NOSCAL.m
/usr/share/octave/site/m/nlopt/NLOPT_GN_ESCH.m
/usr/share/octave/site/m/nlopt/NLOPT_GN_ISRES.m
/usr/share/octave/site/m/nlopt/NLOPT_GN_MLSL.m
/usr/share/octave/site/m/nlopt/NLOPT_GN_MLSL_LDS.m
/usr/share/octave/site/m/nlopt/NLOPT_GN_ORIG_DIRECT.m
/usr/share/octave/site/m/nlopt/NLOPT_GN_ORIG_DIRECT_L.m
/usr/share/octave/site/m/nlopt/NLOPT_G_MLSL.m
/usr/share/octave/site/m/nlopt/NLOPT_G_MLSL_LDS.m
/usr/share/octave/site/m/nlopt/NLOPT_LD_AUGLAG.m
/usr/share/octave/site/m/nlopt/NLOPT_LD_AUGLAG_EQ.m
/usr/share/octave/site/m/nlopt/NLOPT_LD_CCSAQ.m
/usr/share/octave/site/m/nlopt/NLOPT_LD_LBFGS.m
/usr/share/octave/site/m/nlopt/NLOPT_LD_LBFGS_NOCEDAL.m
/usr/share/octave/site/m/nlopt/NLOPT_LD_MMA.m
/usr/share/octave/site/m/nlopt/NLOPT_LD_SLSQP.m
/usr/share/octave/site/m/nlopt/NLOPT_LD_TNEWTON.m
/usr/share/octave/site/m/nlopt/NLOPT_LD_TNEWTON_PRECOND.m
/usr/share/octave/site/m/nlopt/NLOPT_LD_TNEWTON_PRECOND_RESTART.m
/usr/share/octave/site/m/nlopt/NLOPT_LD_TNEWTON_RESTART.m
/usr/share/octave/site/m/nlopt/NLOPT_LD_VAR1.m
/usr/share/octave/site/m/nlopt/NLOPT_LD_VAR2.m
/usr/share/octave/site/m/nlopt/NLOPT_LN_AUGLAG.m
/usr/share/octave/site/m/nlopt/NLOPT_LN_AUGLAG_EQ.m
/usr/share/octave/site/m/nlopt/NLOPT_LN_BOBYQA.m
/usr/share/octave/site/m/nlopt/NLOPT_LN_COBYLA.m
/usr/share/octave/site/m/nlopt/NLOPT_LN_NELDERMEAD.m
/usr/share/octave/site/m/nlopt/NLOPT_LN_NEWUOA.m
/usr/share/octave/site/m/nlopt/NLOPT_LN_NEWUOA_BOUND.m
/usr/share/octave/site/m/nlopt/NLOPT_LN_PRAXIS.m
/usr/share/octave/site/m/nlopt/NLOPT_LN_SBPLX.m
/usr/share/octave/site/m/nlopt/nlopt_minimize.m
/usr/share/octave/site/m/nlopt/nlopt_minimize_constrained.m
/usr/share/octave/site/m/nlopt/nlopt_optimize.m