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diff --git a/src/mame/old/neogeo_helper.h b/src/mame/old/neogeo_helper.h
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+// license:BSD-3-Clause
+// copyright-holders:S. Smith,David Haywood
+
+extern uint32_t neogeohelper_optimize_sprite_data(std::vector<uint8_t> &spritegfx, uint8_t* region_sprites, uint32_t region_sprites_size);