Use game-data-packager to build and install the quake3-data package.
You will need these two files:

--------------- baseq3/pak0.pk3

From a Quake III Arena CD-ROM or installation

size: 479493658 bytes
md5sum: 1197ca3df1e65f3c380f8abc10ca43bf
sha1sum: 9d588ea65e92944d3e23eeb6ec08f1dd666f4658
sha256sum: 7ce8b3910620cd50a09e4f1100f426e8c6180f68895d589f80e6bd95af54bcae

--------------- linuxq3apoint-1.32b-3.x86.run

From any mirror of ftp.idsoftware.com, Gentoo or FreeBSD: for instance try
http://www.filewatcher.com/m/linuxq3apoint-1.32b-3.x86.run.30923961.0.0.html

size: 30923961 bytes
md5sum: c71fdddccb20e8fc393d846e9c61d685
sha1sum: 802d84af0d515db50a496c4c55d1f1c4f40a9239
sha256sum: c36132c5556b35e01950f1e9c646235033a5130f87ad776ba2bc7becf4f4f186
