You can either use an include file to declare the natives/forwards or you could just declare them in each plugin you use the natives in. As long as you properly handle them in the original plugin that you're appending, you should be able to just have
Code:
native bm_add_block
native bm_other_thing
forward bm_block_touch
in each plugin and be able to use them. Just handle them in the main BM plugin, to where you can use the source code from that plugin to help your native handling.
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