If you try to install Avast antvirus on Linux server using rpm you may get error as below :
root@myserver [~]# rpm -ivh avast4server-3.2.1-1.i586.rpm
error: Failed dependencies:
libavastengine >= 4.7.0 is needed by avast4server-3.2.1-1.i586
then you will need to install avast! kernel library libavastengine for this package
You can download it from URL : http://www.avast.com/linux-unix-edition#tab4
and install the required rpm package and then complete the avast installation.