CustomBuild 1.1.26 and 1.2.20 should be released very soon, both versions will support installation of ionCube loaders. Do not hesitate to post more feature requests for the future versions of the CustomBuild script. Thank you!
[root@server custombuild]# ./build ioncube
Downloading ioncube_loaders_lin_x86.tar.gz...
--2011-06-21 22:15:29-- http://files10.directadmin.com/services/custombuild/ioncube_loaders_lin_x86.tar.gz
Resolving files10.directadmin.com... 203.146.249.194
Connecting to files10.directadmin.com|203.146.249.194|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 2679937 (2.6M) [application/x-gzip]
Saving to: `/usr/local/directadmin/custombuild/ioncube_loaders_lin_x86.tar.gz'
100%[======================================>] 2,679,937 185K/s in 15s
2011-06-21 22:15:40 (170 KB/s) - `/usr/local/directadmin/custombuild/ioncube_loaders_lin_x86.tar.gz' saved [2679937/2679937]
grep: /usr/local/lib/php.ini: No such file or directory
./build: line 6516: [: : integer expression expected
ionCube loader has been installed.