private void addExternalReference(Program program, Address start, String libraryName,
			String symbolName, MessageLog log) {
		try {
			program.getReferenceManager().addExternalReference(start, libraryName, symbolName, null,
				SourceType.IMPORTED, 0, RefType.DATA);
		}
		catch (Exception e) {
			log.appendMsg(e.getMessage());
		}
	}
TODO determine how to correctly identify TOC location
Ghidra/Features/Base/src/main/java/ghidra/app/util/opinion/PefLoader.java