Take backup of /etc/httpd and php.ini to be on safer side.

cd /usr/local/directadmin/custombuild
./build update
./build apache

If everything works fine dont rebuild php as that can give some errors
./build php n 

checking for icu-config... no
checking for location of ICU headers and libraries... not found
configure: error: Unable to detect ICU prefix or no failed. Please verify ICU install prefix and make sure icu-config works.

*** There was an error while trying to configure php. Check the custom/suphp/configure.php6 file

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