This is a known issue affecting VMware vFabric Hyperic Server 4.6 and 5.0. Currently, there is no resolution.
To work around this issue, prior to installation, set the environment variable tmpdir to point to a directory where installation processes are allowed to run.
For example:
export TMPDIR=<ALTERNATE_DIRECTORY_PATH>
echo $TMPDIR
You should now be able to launch processes in the /tmp directory.