vstart.sh complains module prettytable not found even when present on the system

Hi, Since almost a week, I have encountered this vstart.sh issue for 5-6 times. After rebuilding a branch few times I come against this issue on running vstart.sh - Populating config ... Traceback (most recent call last): File "/home/rishabh/repos/ceph/multifs-auth/build/bin/ceph", line 151, in <module> from ceph_daemon import admin_socket, DaemonWatcher, Termsize File "/home/rishabh/repos/ceph/multifs-auth/src/pybind/ceph_daemon.py", line 24, in <module> from prettytable import PrettyTable, HEADER ModuleNotFoundError: No module named 'prettytable' It's odd to get this error because, first, vstart.sh was running fine until last time I ran make command and, second, prettytable seems to be present on the system - $ pip list | grep prettytable DEPRECATION: Python 2.7 reached the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 is no longer maintained. A future version of pip will drop support for Python 2.7. More details about Python 2 support in pip, can be found at https://pip.pypa.io/en/latest/development/release-process/#python-2-support prettytable 0.7.2 $ pip2 list | grep prettytable DEPRECATION: Python 2.7 reached the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 is no longer maintained. A future version of pip will drop support for Python 2.7. More details about Python 2 support in pip, can be found at https://pip.pypa.io/en/latest/development/release-process/#python-2-support prettytable 0.7.2 $ Simply running make or install-deps.sh again doesn't fix this issue. I have to delete the build directory and build from scratch again. I am using Fedora 31. Following are my arguments to do_cmake.sh script - -DWITH_PYTHON2=OFF -DWITH_CEPHFS_SHELL=ON -DWITH_BABELTRACE=OFF -DWITH_MANPAGE=OFF -DWITH_RBD=OFF -DWITH_RADOSGW=OFF -DWITH_KRBD=OFF I rebased my branch on my latest master last time (day before yesterday, IIRC) to check if this has already been fixed but that's not the case. Is this a known issue? How do I avoid building from scratch repeatedly? Thanks, - Rishabh