The full source code is provided and all the build script, see the beginning of 6.a. Any user can rebuild it.
The LGPLv2 still contains a clause which prevents you from adding additional restrictions, which Apple do in their policy. (10: ... You may not impose any further restrictions on the recipients' exercise of the rights granted herein. )
I believe, even if you compile from source, you still have additional restrictions placed on you, as Apple's policy for example, restricts you from putting the app on any more than 5 devices.