If you mean the GPL, then you need to release the full source code of your product and the tools necessary to create it. If it's GPL3, and you also sell hardware, you need to make sure customers can replace the software on it.
If it's an LGPL, you can link to it without affecting the above, but not statically!
Subjective: Personally, I think the GPL is too strict, I would look for alternative projects under the MPL or BSD licensing models that you could create on your software.
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