How to enable PHP GMP --with-gmp on DirectAdmin CustomBuild

[Andy]

If you want to add any extra modules to PHP, they'll most likely need to be compiled in. Any module that needs to be compiled in will have a --with-gmp type flag which will need to be used.

1. First, figure out which configure file your system is using. Type:
   

   cd /usr/local/directadmin/custombuild
   ./build used_configs | grep configure.php

   Depending on your PHP version, it might look like this:
   

   PHP (default) configuration file: /usr/local/directadmin/custombuild/configure/fpm/configure.php72

   Change in the values if they're different.
2. To add this flag, run the following:
   

   cd /usr/local/directadmin/custombuild
   mkdir -p custom/fpm
   cp -fp configure/fpm/configure.php72 custom/fpm/configure.php72

3. Add your --with-gmp line to the end of the custom/fpm/configure.php72 file, and make sure the \ character exists at the end of all lines except the last one. The \ character tells the line configure line to loop to the next line, making the configure settings easier to read. Without the \ character to trigger the wrap, the next line becomes a separate command, which is not correct. (see error below). Once set, type:
   

   ./build php n

   Change configure.php5 to configure.php4 if you're using php4.
   If you're using suphp, the paths would be configure/suphp/configure.php5 and custom/suphp/configure.php5.
   • If you get the following error message:

     configure: error: Unable to locate gmp.h

   • Check if the following file is exist:

     /usr/include/x86_64-linux-gnu/gmp.h

     If not:

     sudo apt-get install libgmp-dev

4. Restart apache:
   RedHat:
   

   /sbin/service httpd restart

   FreeBSD:
   

   /usr/local/etc/rc.d/httpd restart

Another common error people run into looks like this:

/usr/local/directadmin/custombuild/custom/fpm/configure.php72: line 36: --with-gmp: command not found

Which simply means that the \ character was not correctly added on the line before --with-gmp.