AIX: need to free up space for an installation

AIX:  Need space

The software I am installing says that I need more sapce in /tmp

WARNING! The amount of / disk space required to perform
this installation is greater than what is available.  Please
free up at least 1647577 kilobytes in / and attempt this

Select allOpen in new window

I perform a df and see the folloiwng:

# df
Filesystem    512-blocks      Free %Used    Iused %Iused Mounted on
/dev/hd4         1048576    669288   37%    10084    12% /
/dev/hd2        13107200   1727192   87%    51740    21% /usr
/dev/hd9var      1048576    493264   53%     6368    11% /var
/dev/hd3          524288    514480    2%       61     1% /tmp
/dev/hd1        18874368   5139784   73%      184     1% /home
/dev/hd11admin     524288    523488    1%        5     1% /admin
/proc                  -         -    -         -     -  /proc
/dev/hd10opt     1048576    765304   28%     6971     8% /opt
/dev/livedump     524288    523552    1%        4     1% /var/adm/ras/livedump
10.14.10.10:CTTShare 7569430544 129391840   99%        0     0% /mnt/archiver

Select allOpen in new window

How can I increase the amount of space needed for /tmp

Thanks