Sfcgal is a c++ wrapper library around cgal with the aim of supporting iso 19107:2013 and ogc simple features access 1.2 for 3d operations.

sfcgal provides standard compliant geometry types and operations, that can be accessed from its c or c++ apis. postgis uses the c api, to expose some sfcgal's functions in spatial databases (cf. postgis manual).

this part is the runtime package of the library.