Linux native version of Torchlight won't install

[atomicfro]

I'm on LMDE, and I can't get the installer for the Linux native Torchlight game to install.
It always ends with:
Error: Lua error detected: Failed to create package: No space left on device
while moving files back and forth in /tmp.

A google search came up with https://alderaan.archlinux.org/viewtopic.php?id=149236 on the arch boards. However it doesn't help me because I don't have an tempfs line in my fstab.
fstab:

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# /etc/fstab: static file system information.
#
# <file system> <mount point>   <type>  <options>       <dump>  <pass>
proc	/proc	proc	defaults	0	0
# /dev/sda2
UUID=dc953a52-5a2f-4394-816d-35bca23d152b	swap	swap	sw	0	0
# /dev/sda3
UUID=fab79a5b-e465-4494-9d93-3a0e0884646f	/	ext4	rw,errors=remount-ro	0	1

My drive has 432.6 gigs free, so its not a question of whether I have the physical disk space available. Any help on getting passed this would be greatly appreciated.

[atomicfro]

I got the game to install using an opposite fix from the guy at the arch forums.
I let the system use about 1gb of ram for /tmp using the following command:

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sudo mount -t tmpfs tmpfs /tmp -o size=1000M,mode=1777

That gave the the installer enough /tmp space to do what it wanted.
Unfortunately I don't understand why I would have to do that. /tmp was mounted on root and there should have been plenty of space.