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I tried to install additional PHP version 8.3 and get this error:

directadmin checking if iconv supports errno… configure: error: iconv does not support errno

System is using old iconv version and Directadmin is not using its own libiconv anymore. You can use iconv version from /usr/local instead. Go to /usr/local/directadmin/custombuild/configure/php/configure.php83 and add this line:

--with-iconv=/usr/lib \

Then install new PHP version and it should work:

[root@server custombuild]# ./build php_expert 8.3 php-fpm