php can find it when `sparkline/Sparkline.php` is required.
* The GD PHP module used by the Sparkline library.
* A "php" program in the path, that can run standalone php programs.
-* [[!cpan Digest::SHA1]]
+* [[!cpan Digest::SHA]]
On a Debian system, this can be accomplished by installing these packages:
`libsparkline-php` `php5-gd` `php5-cli` `libdigest-sha1-perl`