This version of Unity is unsupported.
Method group is Obsolete

AssemblyBuilder.defaultReferences

Obsolete This feature is being deprecated and will be removed in the future. Similar functionality can be achieved using the Roslyn compiler. public string[] defaultReferences;

Description

Default references used when compiling the assembly.

The same default references that are added to scripts inside the Assets folder are added the assembly build. This property returns the default references.

The default references are in part controlled by AssemblyBuilder.flags, AssemblyBuilder.buildTarget and AssemblyBuilder.buildTargetGroup.