I think a "PATH" should be specified or /usr/bin/env curl
Error: Validation of Exec[download n98-magerun] failed: 'curl -L -o n98-magerun.phar https://raw.githubusercontent.com/netz98/n98-magerun/master/n98-magerun.phar' is not qualified and no path was specified. Please qualify the command or specify a path. at /etc/puppet/modules/n98magerun/manifests/init.pp:23
I think a "PATH" should be specified or
/usr/bin/env curl