Not enough disk space error when installing on Yocto embedded Linux OS.

When running the install.sh script get the following error:

Error: not enough disk space in "/tmp" temporary directory. 100 MB is required for startup.

A df -h shows shows:

Filesystem   Size   Used   Available   Use%   Mounted on

tmpfs            1.9G  1.2M   1.9G          0%       /tmp

So there appears to be enough space in /tmp?

Also /tmp has rwx permissions for everyone.