* A "php" program in the path, that can run standalone php programs.
* [[cpan Digest::SHA1]]
-On a Debian system, this can be accomplished by installing the
-`libsparkline-php`, `php5-gd`, `php5-cli`, and `libdigest-sha1-perl`
-packages.
+On a Debian system, this can be accomplished by installing these packages:
+`libsparkline-php` `php5-gd` `php5-cli` `libdigest-sha1-perl`
# examples