./build: line 12786: autoreconf: command not found

If you're trying to compile apache, but run into this error:

Configuring httpd-2.4.18
./build: line 12786: autoreconf: command not found

try updating autoconf and automake:

cd /usr/local/directadmin/custombuild
./build update
./build autoconf
./build automake

and then try the apache compile again.