Configure errors with sh

When running configure in sh messages appear saying:

./configure: test: argument expected

Running it as "/bin/sh -x ./configure ..." showed that they are caused by commands

[ ! -e some_file ]

"man test" states that

-e file True if file exists. (Not available in sh.)

(Note the remark in parentheses!)

Please fix. (e.g. change "-e" to "-f".)