If you have a console app then there’s a decent chance that all the modules you’re using are under the ISC license, which has no restrictions at all other than the usual disclaimer of all warranties…
The JUCE modules under the ISC license are juce_core, juce_events, juce_audio_basics, juce_audio_devices, juce_blocks_basics.
There have also been a lot of Linux improvements in JUCE 5, including removing the X11 dependency: X11, MIDI and other Linux improvements