10.3 source tree does not build on an offline system

I noticed while working on an airplane that the current 10.3 source does not build on a laptop that is offline.

I have attached two build logs that are generated using the exactly same build command at the exactly same commit (). However, when my system was offline, the build failed. The issue is easily repeatable.

I consider this a bug. In most Linux distributions builds are done in offline systems due to security reasons. If a source does something online as part of the cmake build step, it is against the policy of most Linux distributions.

I've looked at the diff of the build logs online vs offline, but both versions have the same libtool related lines and I cannot figure out what is the actual error why the build stops.