Download the latest version of joebot here:
http://joebot.bots-united.com/downloads.html
Then unzip/gunzip/untar the archive into your Half-Life directory. If you installed it correctly, you should have cstrike\joebot\joebot_mm.dll (or joebot_mm_i386.so if it's linux).
Next, follow the instructions for metamod installation here:
http://metamod.org/metamod.html
Pay attention to the part where it mentions the file named liblist.gam. When you're done installing metmod, add the following to your metmod plugins.ini:
win32 joebot/joebot_mm.dll
linux joebot/joebot_mm_i386.so
That's it. This works for me.