$ pear install http_request2
Connection to 'pear.php.net:443' failed: 

$ pear -vvv install html_quickform2
Warning: fsockopen(): SSL operation failed with code 1. OpenSSL Error messages:
error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed in PEAR/Downloader.php on line 1627
Warning: fsockopen(): Failed to enable crypto in PEAR/Downloader.php on line 1627
Warning: fsockopen(): unable to connect to ssl://pear.php.net:443 (Unknown error) in PEAR/Downloader.php on line 1627
Connection to 'pear.php.net:443' failed: 

$ apt-get install ca-certificates
$ pear install http_request2
.. works
