Note that 1. this is mostly regarding the Steamworks SDK that you link to; sufficient care may be taken to try to make this linkage to Steamworks "compliant" as

Note that 1. this is mostly regarding the Steamworks SDK that you link to; sufficient care may be taken to try to make this linkage to Steamworks "compliant" as noted in the article, and 2. this is about GPL, not LGPL. Distributing LGPL code via Steam may introduce some potential murkiness, but it should be mostly kosher since I think Steam doesn't, in and of itself, impede on the user's ability to exercise the rights granted by LGPL.