Package: python3.9 Version: 3.9.1-1 Severity: normal Please consider replacing the GPL-3 licensed build dependency libreadline-dev with libedit-dev, which is also supported by Python. The GPL-3 is incompatible with some licenses such as GPL-2-only. Therefore, a foundational package such as Python should choose the more liberally licensed dependency to allow as much software in the archive as possible without license headaches.
Most probably, there is already a GPL-2-only Python software in the archive that uses the readline module but I did not check.
