c('PL_register_extensions')

Documentation
- Reference manual
  - Foreign Language Interface
    - The Foreign Include File
      - Registering Foreign Predicates
        
        PL_register_foreign_in_module()
        
        PL_register_foreign()
        
        PL_register_extensions_in_module()
        
        PL_register_extensions()
- Packages

> Same effect as using --traditional