root@serverman:~# cat test.c 
#include <mysql/mysql.h>
int x;

root@serverman:~# gcc -o test test.c
In file included from /usr/include/mysql/mysql.h:64:0,
                 from test.c:1:
/usr/include/mysql/mysql/client_plugin.h:103:38: fatal error: mysql/plugin_auth_common.h: No such file or directory
compilation terminated.
root@serverman:~# ls /usr/include/mysql/
big_endian.h              errmsg.h         my_alloc.h      my_dbug.h    mysql               mysql_embed.h    my_thread.h        plugin_group_replication.h  sql_state.h        thr_mutex.h
binary_log_types.h        keycache.h       my_byteorder.h  my_dir.h     mysql_com.h         mysql.h          my_thread_local.h  plugin.h                    sslopt-case.h      thr_rwlock.h
byte_order_generic.h      little_endian.h  my_command.h    my_getopt.h  mysql_com_server.h  mysql_time.h     my_xml.h           plugin_keyring.h            sslopt-longopts.h  typelib.h
byte_order_generic_x86.h  m_ctype.h        my_compiler.h   my_global.h  mysqld_ername.h     mysql_version.h  plugin_audit.h     plugin_validate_password.h  sslopt-vars.h
decimal.h                 m_string.h       my_config.h     my_list.h    mysqld_error.h      my_sys.h         plugin_ftparser.h  sql_common.h                thr_cond.h