Description of problem:
The %post scriptlet has:

#
# Need to figure out what to do here with ACPI when APM is off
#
apm=false
if [ -f /proc/apm ]; then   # Battery present if top bits are unset
  flag=$(cat $1 | cut -d ' ' -f 6 | sed 's/0x\([0-9a-f]\)[0-9a-f]/\1/')
  if [ "$flag" == "0" ]; then
    apm=true
  fi
fi

The 'flag=' line should probably start:

  flag=$(cat /proc/apm | ...

Version-Release number of selected component (if applicable):
2.6.0-6

   6:gnome-panel   ########################################### [ 17%]
cat: 2: No such file or directory