1.1.7 Can I use my original NIB files?

No - NeXT/Apple never documented their nib format, so GNUstep supports both the ’gmodel’ format (which stores information as text (property-lists) and can therefore be edited ’by hand’) and binary archive format (which can be edited by Gorm). There IS a conversion tool called nib2gmodel that can be compiled under OPENSTEP to convert nib files to GNUstep gmodel files.

The current version of gui supports reading nib files created as of 10.2. If you have nib files which are older than this, you can convert them by loading them into Interface Builder, going to the "file" second and saving the nib using the "10.2 or later format."