The splines package is part of the Octave Forge project.
Follows an incomplete list of stuff missing in the splines package to be Matlab compatible. Bugs are not listed here, search and report them on the bug tracker instead.
Note: this entire section is about the current development version. If a splines-related Matlab function (from the Curve Fitting toolbox) is missing from the list and does not appear on the current release of the package, confirm that is also missing in the development sources before adding it.