[root@lehrpc DBD-mysql-4.022]# perl Makefile.PL --testuser=root --testpassword=geheim --mysql_config=/etc/my.cnf
Can't exec "/etc/my.cnf": Permission denied at Makefile.PL line 479.
Can't find mysql_config. Use --mysql_config option to specify where mysql_config is located
Can't exec "/etc/my.cnf": Permission denied at Makefile.PL line 479.
Can't find mysql_config. Use --mysql_config option to specify where mysql_config is located
Can't exec "/etc/my.cnf": Permission denied at Makefile.PL line 479.
Can't find mysql_config. Use --mysql_config option to specify where mysql_config is located
Can't exec "/etc/my.cnf": Permission denied at Makefile.PL line 479.
Can't find mysql_config. Use --mysql_config option to specify where mysql_config is located
Failed to determine directory of mysql.h. Use

  perl Makefile.PL --cflags=-I<dir>

to set this directory. For details see the INSTALL.html file,
section "C Compiler flags" or type

  perl Makefile.PL --help