/usr/share/openscad/libraries/ is in openscad-mcad 2014.03-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/openscad/libraries/MCAD/
/usr/share/openscad/libraries/MCAD/2Dshapes.scad
/usr/share/openscad/libraries/MCAD/3d_triangle.scad
/usr/share/openscad/libraries/MCAD/bearing.scad
/usr/share/openscad/libraries/MCAD/bitmap/
/usr/share/openscad/libraries/MCAD/bitmap/alphabet_block.scad
/usr/share/openscad/libraries/MCAD/bitmap/bitmap.scad
/usr/share/openscad/libraries/MCAD/bitmap/height_map.scad
/usr/share/openscad/libraries/MCAD/bitmap/letter_necklace.scad
/usr/share/openscad/libraries/MCAD/bitmap/name_tag.scad
/usr/share/openscad/libraries/MCAD/boxes.scad
/usr/share/openscad/libraries/MCAD/constants.scad
/usr/share/openscad/libraries/MCAD/curves.scad
/usr/share/openscad/libraries/MCAD/fonts.scad
/usr/share/openscad/libraries/MCAD/gears.scad
/usr/share/openscad/libraries/MCAD/gridbeam.scad
/usr/share/openscad/libraries/MCAD/hardware.scad
/usr/share/openscad/libraries/MCAD/involute_gears.scad
/usr/share/openscad/libraries/MCAD/layouts.scad
/usr/share/openscad/libraries/MCAD/lego_compatibility.scad
/usr/share/openscad/libraries/MCAD/libtriangles.scad
/usr/share/openscad/libraries/MCAD/materials.scad
/usr/share/openscad/libraries/MCAD/math.scad
/usr/share/openscad/libraries/MCAD/metric_fastners.scad
/usr/share/openscad/libraries/MCAD/motors.scad
/usr/share/openscad/libraries/MCAD/multiply.scad
/usr/share/openscad/libraries/MCAD/nuts_and_bolts.scad
/usr/share/openscad/libraries/MCAD/polyholes.scad
/usr/share/openscad/libraries/MCAD/regular_shapes.scad
/usr/share/openscad/libraries/MCAD/screw.scad
/usr/share/openscad/libraries/MCAD/servos.scad
/usr/share/openscad/libraries/MCAD/shapes.scad
/usr/share/openscad/libraries/MCAD/stepper.scad
/usr/share/openscad/libraries/MCAD/teardrop.scad
/usr/share/openscad/libraries/MCAD/transformations.scad
/usr/share/openscad/libraries/MCAD/triangles.scad
/usr/share/openscad/libraries/MCAD/trochoids.scad
/usr/share/openscad/libraries/MCAD/units.scad
/usr/share/openscad/libraries/MCAD/unregular_shapes.scad
/usr/share/openscad/libraries/MCAD/utilities.scad