Python problem when building RedisJSON under Slackware 15.0

I am trying to build the RedisJSON package under Slackware 15.0, so far without any success. I followed the steps described in https://redis.io/docs/data-types/json. When I invoked ./sbin/setup, as prescribed in that page, I ended up with the following:
Code:Traceback (most recent call last):
File "/home/abc/RedisJSON/sbin/system-setup.py", line 68, in <module>
RedisJSONSetup(args).setup()
File "/home/abc/RedisJSON/sbin/system-setup.py", line 17, in __init__
paella.Setup.__init__(self, args.nop)
File "/home/abc/RedisJSON/deps/readies/paella/setup.py", line 380, in __init__
self.package_manager = PackageManager.detect(self.platform, self.runner)
File "/home/abc/RedisJSON/deps/readies/paella/setup.py", line 152, in detect
raise Error("Cannot determine package manager for distibution %s" % platform.dist)
paella.error.Error: Cannot determine package manager for distibution slackware

In /home/abc/RedisJSON/sbin/setup:
18 python3 -m pip list
19 fi
20
21 >>> $ROOT/sbin/system-setup.py
22 if [[ $VERBOSE == 1 ]]; then
23 python3 -m pip list
24 fiAnybody know how to sort this out?