Why aren't you just using the Ubuntu 20.04 packaged version instead?

Also, did you install the headers for libmysqlclient properly as

well?

What does /test/core/mariadb/includes/ or

/test/core/includes/... show?

Hi John,

i just want to manage all the software manually, use own directorie-structur and have all the
programs in one place, deepen my understanding how these programs work and build these
programs only with the components i need.

The content of "/test/core/mariadb/include/mysql" is:

errmsg.h
ma_list.h
ma_pvio.h
mariadb/
mariadb/ma_io.h
mariadb_com.h
mariadb_ctype.h
mariadb_dyncol.h
mariadb_rpl.h
mariadb_stmt.h
mariadb_version.h
ma_tls.h
my_config.h
my_global.h
mysql/
mysql/client_plugin.h
mysql/plugin_auth_common.h
mysql/plugin_auth.h
mysql_com.h
mysqld_error.h
mysql.h
mysql_version.h
my_sys.h
server/...