Hotplug2 is a trivial replacement of some of the UDev functionality
in a tiny pack, intended for Linux early userspace: Init RAM FS and InitRD.
endef
-MAKE_FLAGS += CFLAGS="$(TARGET_CFLAGS) -DHAVE_RULES"
+MAKE_FLAGS += CFLAGS="$(TARGET_CFLAGS) -DHAVE_RULES -I."
define Package/hotplug2/install
$(INSTALL_DIR) $(1)/etc