How to deal with manufacturer-specific packages based on standard packages

[eduardosm]

Sometimes, manufactures define packages that are modified versions of standard packages.

For example: https://www.infineon.com/package/PG-DSO-12-24

This package is like SOIC127P600X175-16, but with four pins removed.

Should the footprint (pad dimensions) match the manufacturer's? Or should it follow how the rest of LibrePCB's SOIC packages are made?