Provisioning fails with "The temp space is not sufficient". Why?

I'm attempting to provision a standalone database instance to the file system using EM provisioning.

It's failing with:

2. The temp space is not sufficient. Please ensure that at you have atleast 3.5G available and then retry this step. Working directory usage :

61020   . 

However:

[oracle@myserver  ~]$ df -kh

Filesystem            Size  Used Avail Use% Mounted on

/dev/mapper/VolGroup00-LogVol00

                       26G  6.7G   18G  29% /

/dev/sda1              99M   13M   82M  14% /boot

tmpfs                 3.9G     0  3.9G   0% /dev/shm

/dev/mapper/VolGroup01-LogVol00

                       69G  6.7G   59G  11% /s01

[oracle@myserver  ~]$ free

             total       used       free     shared    buffers     cached

Mem:       8174532    1451428    6723104          0     363016     566324

-/+ buffers/cache:     522088    7652444

Swap:      4095992         92    4095900

That looks to me like there's over 3.5Gb free.