Copy DISTRIBUTABLES relative to plugin directory.

plugin.mk

@@ -62,7 +62,11 @@ else
 	$(STRIP) -s dist/$(SLUG)/$(TARGET)
 endif
 	@# Copy distributables
-	cp -R $(DISTRIBUTABLES) dist/$(SLUG)/
+ifdef ARCH_MAC
+	rsync -rR $(DISTRIBUTABLES) dist/$(SLUG)/
+else
+	cp -R --parents $(DISTRIBUTABLES) dist/$(SLUG)/
+endif
 	@# Create ZIP package
 	cd dist && zip -q -9 -r $(SLUG)-$(VERSION)-$(ARCH).zip $(SLUG)