The IHG did some work to move the GMP dependency from the RTS to a new integer-gmp package. The base library now uses this package to implement the Integer type. It is also possible to use an alternative integer package but you have to rebuild base and the rest of the world. The default remains integer-gmp.
So what you are saying is that the Haskell Platform already includes (by default, unless someone goes to unusual lengths to avoid it), an LGPL library, which no-one has (yet) objected to.
I'm pretty sure that under a strict reading we're violating the licence of the H98 and FFI reports because we do not reproduced them in their entirety.
The H'98 (pace H'2010) licence says: "The authors and publisher intend this Report to belong to the entire Haskell community, and grant permission to copy and distribute it for any purpose, provided that it is reproduced in its entirety, including this Notice. Modified versions of this Report may also be copied and distributed for any purpose, provided that the modified version is clearly presented as such, and that it does not claim to be a definition of the language Haskell 98[2010]." Distributing the source code of the H'98 (2010) libraries is indeed a failure to distribute the Report in its entirety. But as long the source code makes it clear that it does not claim to be an unmodified _definition_ of the language (or libraries?), then I think the licence permits it. Regards, Malcolm