Hi Serg, As you suggested, I compared .deb file contents with what `make install` produces in 5.5. I discovered that the following files are missing from .debs. I need help understanding which of these should be added to the .debs. (I think anything added should be to package libmariadbclient-dev): /usr/lib/libmysqlservices.a /usr/include/mysql.h /usr/include/mysql_com.h /usr/include/mysqld_ername.h /usr/include/mysqld_error.h /usr/include/mysql_embed.h /usr/include/mysql/psi /usr/include/mysql/psi/mysql_file.h /usr/include/mysql/psi/mysql_thread.h /usr/include/mysql/psi/psi_abi_v1.h /usr/include/mysql/psi/psi_abi_v2.h /usr/include/mysql/psi/psi.h /usr/include/client_plugin.h /usr/include/decimal.h /usr/include/errmsg.h /usr/include/keycache.h /usr/include/m_ctype.h /usr/include/m_string.h /usr/include/my_alloc.h /usr/include/my_attribute.h /usr/include/my_compiler.h /usr/include/my_dbug.h /usr/include/my_getopt.h /usr/include/my_global.h /usr/include/my_list.h /usr/include/my_net.h /usr/include/my_pthread.h /usr/include/mysql_time.h /usr/include/mysql_version.h /usr/include/my_sys.h /usr/include/my_valgrind.h /usr/include/my_xml.h /usr/include/plugin_audit.h /usr/include/plugin_auth.h /usr/include/plugin_ftparser.h /usr/include/plugin.h /usr/include/sql_common.h /usr/include/sql_state.h /usr/include/sslopt-case.h /usr/include/sslopt-longopts.h /usr/include/sslopt-vars.h /usr/include/typelib.h It seems pretty obvious that "mysql.h" is needed. But should I add _all_ the .h files? And what about libmysqlservices.a? - Kristian.