

The first line of this file, if it is not empty, specifies a command that
will be used for checksumming, to determine whether files need to be remade
during the second and subsequent runs of package/compile.  (If you run
package/compile only once, as is typical, then this command will not matter.)
If you do not specify a command, then package/compile will use the first
command that exists among sha1sum, md5sum, md5, cksum, and sum.
