I am trying to run Net2FTP (a web FTP client) on my OES/Linux server. One
of the functions of this set of PHP scripts is compression on the fly for
multiple file downloads. When trying to use this function I get an error:

Fatal error: Call to undefined function: gzcompress() in
/srv/www/htdocs/net2ftp/includes/zip.lib.php on line 111

Support forums for Net2FTP tell me that I need to recompile PHP with zlib
support. Being unsure of what the ramifications are and what the process is
I would like some patient instruction on this along with the setting changes
I need to make in the php.ini

Thanks in advance for any pointers!