Syntax error in /usr/lib/stonith/plugins/external/ipmi (used by command stonith)

Binary package hint: heartbeat

When running the command "stonith -h" there are syntax errors printed on STDERR.
To reproduce, filter out STDOUT, i.e. run the command like this:

$ stonith -h > /dev/null
/usr/lib/stonith/plugins/external/ipmi: 38: Syntax error: "(" unexpected
/usr/lib/stonith/plugins/external/ipmi: 38: Syntax error: "(" unexpected
/usr/lib/stonith/plugins/external/ipmi: 38: Syntax error: "(" unexpected

Row 38 in /usr/lib/stonith/plugins/external/ipmi looks like this:
function have_ipmi() {

it seems that this type of function declaration is not compatible with the default /bin/sh in Ubuntu 8.04 desktop.

If I change the first row in the ipmi script FROM:
#!/bin/sh
TO:
#!/bin/bash
the error goes away (because bash is compatible with this function declaration).

I don't know what is the correct solution,
- either convert this to a bash script, or
- make the function declarations /bin/sh compatible