Error in downloaded UE 5.0 source C2079 in ShaderParameterMetadata.h line 43

I have been working my way through various errors in the source (mainly unable to find h file) and now hit a code problem that may be a missed out h include.
The error summary is

Severity Code Description Project File Line Suppression State
Error C2079 ‘FUniformBufferStaticSlotRegistrar’ uses undefined class ‘RENDERCORE_API’ UnrealFileServer E:\UnrealEngine\Engine\Source\Runtime\RenderCore\Public\ShaderParameterMetadata.h 43

line near 43 looks like this
/** Simple class that registers a uniform buffer static slot in the constructor. /
class RENDERCORE_API FUniformBufferStaticSlotRegistrar
FUniformBufferStaticSlotRegistrar(const TCHAR
Anyone any hints for me?