Changes to the libclamav API:

• Those who build applications around our shared library will need to change how they declare and pass scanning options to libclamav. Please take a look at the change to our example code for details. 
• Scanning functions now have a filename argument. The argument is optional, but improves the efficiency when parsing certain types that require a file on disk to open and read, and will allow for additional improvements in the future.
• Many of the scanning option #defines have changed. These can be found in our clamav.h header.
• The libclamav version number has changed.

Some of the clamd config and clamscan command line option names have changed. The original versions will still work for a time, but eventually they will be deprecated. These options in question are detailed in the NEWS document.