The 'Roundcube Webmail Installer' says:
### The next couple of extensions are optional and recommended to get the best performance:
FileInfo: NOT AVAILABLE(Could be loaded. Please add in php.ini; See http://www.php.net/manual/en/book.fileinfo.php) Libiconv: OK Multibyte: OK OpenSSL: OK Mcrypt: NOT AVAILABLE(Could be loaded. Please add in php.ini; See http://www.php.net/manual/en/book.mcrypt.php) Intl: OK Exif: NOT AVAILABLE(Could be loaded. Please add in php.ini; See http://www.php.net/manual/en/book.exif.php) ###
The link provided for Fileinfo has "This extension has no configuration directives defined in php.ini." (when you dig into the links on the first page)
I know I have these installed:
php55-fileinfo-5.5.21 libmcrypt-2.5.8_2 php55-mcrypt-5.5.21_1 php55-exif-5.5.21
Could someone please indicate what php.ini entries are necessary to get those extensions to work?
— Dan Langille http://langille.org/