$ ls -l mariadb-connector-cpp-0.9.3-beta-ubuntu-bionic-amd64/include/mariadbcpp/

total 116

-rw-r--r-- 1 geoff geoff  5913 Aug 11 08:10 CallableStatement.h

drwxr-xr-x 2 geoff geoff  4096 Aug 11 08:13 compat

-rw-r--r-- 1 geoff geoff  1465 Aug 11 08:10 ConnCpp.h

-rw-r--r-- 1 geoff geoff  5119 Aug 11 08:10 Connection.h

-rw-r--r-- 1 geoff geoff 14295 Aug 11 08:10 DatabaseMetaData.h

-rw-r--r-- 1 geoff geoff  1928 Aug 11 08:10 Driver.h

-rw-r--r-- 1 geoff geoff  8358 Aug 11 08:10 Exception.h

-rw-r--r-- 1 geoff geoff  3969 Aug 11 08:10 jdbccompat.h

-rw-r--r-- 1 geoff geoff  1949 Aug 11 08:10 ParameterMetaData.h

-rw-r--r-- 1 geoff geoff  7173 Aug 11 08:10 PreparedStatement.h

-rw-r--r-- 1 geoff geoff 14011 Aug 11 08:10 ResultSet.h

-rw-r--r-- 1 geoff geoff  2549 Aug 11 08:10 ResultSetMetaData.h

-rw-r--r-- 1 geoff geoff  1362 Aug 11 08:10 Savepoint.h

-rw-r--r-- 1 geoff geoff  4914 Aug 11 08:10 SQLString.h

-rw-r--r-- 1 geoff geoff  4067 Aug 11 08:10 Statement.h

-rw-r--r-- 1 geoff geoff  1704 Aug 11 08:10 Types.h

-rw-r--r-- 1 geoff geoff  1504 Aug 11 08:10 Warning.h

$ g++ -o Conn.o Conn.cpp -std=c++11 -lmariadbcpp

In file included from Conn.cpp:3:0:

/usr/include/mariadbcpp/ConnCpp.h:25:10: fatal error: DriverManager.h: No such file or directory

 #include "DriverManager.h"

          ^~~~~~~~~~~~~~~~~

compilation terminated.

$ wget https://raw.githubusercontent.com/mariadb-corporation/mariadb-connector-cpp/master/include/DriverManager.h

$ sudo install DriverManager.h /usr/include/mariadbcpp/