Slackware - Cannot install - Not enough space on partition mounted at /.

I’m trying to install CUDA sdk on Slackware Linux, using: But the installer complains about not enoug space on the device. Here is the full listing:

Do you accept the previously read EULA? (accept/decline/quit): accept
You are attempting to install on an unsupported configuration. Do you wish to continue? ((y)es/(n)o) [ default is no ]: y
Install the CUDA 6.5 Toolkit? ((y)es/(n)o/(q)uit): y
Enter Toolkit Location [ default is /usr/local/cuda-6.5 ]: 
Do you want to install a symbolic link at /usr/local/cuda? ((y)es/(n)o/(q)uit): 
Do you want to install a symbolic link at /usr/local/cuda? ((y)es/(n)o/(q)uit): y
Install the CUDA 6.5 Samples? ((y)es/(n)o/(q)uit): y
Enter CUDA Samples Location [ default is /home/ghi ]: 
Not enough space on parition mounted at /.
Need 1563279360 bytes.

Disk space check has failed. Installation cannot continue.

The result of df command:

Filesystem     1K-blocks      Used Available Use% Mounted on
/dev/sda1       19097204  16179016   1925056  90% /
/dev/sda3        9483076    979028   7999288  11% /usr/local
/dev/sda2      432423184 137239116 273195184  34% /home
tmpfs            2019108         0   2019108   0% /dev/shm

Any suggestions?

Your /dev/sda1 filesystem mounted on / is 90% full. Things have to be unpacked before they can be put where you want them. Get a larger hard disk, or free up space on /dev/sda1. You might also specify a different location for the temp storage to see if that helps. Run the installer with --help to learn about additional install options, such as how to specify different temp storage. But I’m not sure that temp storage is the issue.

-tmpdir has helped. Thank you.