C = dlgetnflowincludes() returns the include directories needed to build a native nflow block plugin.

The result lists the nflow_blocks public headers (BlockPlugin.h, SimEngineTypes.hpp, and others), then the Nelson SDK include directories. The Nelson directories provide nlohmann/json.hpp, which is included by SimEngineTypes.hpp.

The paths are resolved whether Nelson runs from its source tree or from an installation.

This function is typically passed to dlgeneratemake.