Presuming you used custombuild to install Apache etc..
#1 Locate the appropriate configure.apache file which, if you installed Apache 2.2, should be located at
/usr/local/directadmin/custombuild/configure/ap2/configure.apache
#2 Add the following line to the bottom of configure.apache
Code:
"--enable-ext-filter"
but also remember to add a backslash to the line above it, for example if before the change you have