Comment 1 for bug 803472

At line 1181 replace:

if [ $concurrent_insert -le 1 ] && [ "$mysql_version_num" -gt 050000 ] ; then
cecho "If you have a high concurrency of inserts on Dynamic row-length tables"
cecho "consider setting 'concurrent_insert=2'."
fi

with:

if [ "$mysql_version_num" -gt 050000 ] && [ "$mysql_version_num" -lt 050500 ]; then
 if [ $concurrent_insert -le 1 ] ; then
  cecho "If you have a high concurrency of inserts on Dynamic row-length tables"
  cecho "consider setting 'concurrent_insert=2'."
 fi
elif [ "$mysql_version_num" -gt 050500 ] ; then
 if [ "$concurrent_insert" = 'AUTO' ] || [ "$concurrent_insert" = 'NEVER' ] ; then
  cecho "If you have a high concurrency of inserts on Dynamic row-length tables"
  cecho "consider setting 'concurrent_insert=2'."
 fi
fi

Thank it should work for MySQL 5.5, too.