RequiredHouses

Flag:	RequiredHouses
File(s):	rules(md).ini
Values:	Comma-separated list of strings. (Limited to: Countries, maximum of 32 entries)
Default:	none
Applicable to:	TechnoTypes: AircraftTypes, BuildingTypes, InfantryTypes and VehicleTypes

Lists the specific houses which have exclusive rights to build this object. The object cannot be built even if other houses capture the appropriate Prerequisite= and acquire the relevant TechLevel= required to construct it.

Editor's note: "unsetting" this tag by overriding it using RequiredHouses=<none> or just leaving the RequiredHouses= list empty under the unit's section in a map (or in an INI loaded with Ares' #include) will not work. In such a case all Countries must be listed under RequiredHouses= (or better in Ares' #include case, have the flag removed from base rules entirely) before every Country is eligible to build this TechnoType. This is not quite valid for ForbiddenHouses, however. <none> will do the trick there and unset the base rules' list, but an empty list will not do anything.