First, make sure you install all of the prerequisites:
http://wiki.openkore.com/index.php/How_to_run_OpenKore

Then do this:

cd ~
git clone https://github.com/openkore/openkore

YAY NOW IT'S INSTALLED!!!

cd openkore
perl openkore.pl


Want to be a hacker and use the same repo for multiple folders with different plugins and stuff???
mkdir korelink
mkdir korelink/plugins
mkdir korelink/profiles
cp ~/openkore/openkore.pl ~/korelink
ln -sv ~/openkore/* ~/korelink


USE THESE CONFIGS FOR BONUS POINTS!!!
conf autoTalkCont 0
conf route_randomWalk 0
conf attackAuto 0
conf attackAuto_party 0
conf route_maxWarpFee 10000
conf sitAuto_idle 0
conf logChat 1
conf logEmoticons all
conf minStorageZeny 0
conf relogAfterStorage 0
conf storageAuto_keepOpen 1
conf storageAuto_npc_steps c r1 c r0
conf storageAuto_npc_type 3
conf storageAuto_npc prontera 151 29
conf guildAutoDeny 0
conf partyAuto 0
conf dealAuto 0
conf teleportAuto_maxDmg 0
conf itemsTakeAuto 0
conf itemsGatherAuto 0
conf followEmotion 1
conf followEmotion_distance 15
conf followFaceDirection 1
conf dcOnDeath -1
conf dcOnStorageFull 0
conf avoidList 0

We're in.