DBD::mysqlがMacPortsでビルドされたMySQLを使う為のオプション

MySQL5はMacPortsでインストール。
Perl5.10.0は/usr/local/perl5.10.0 に野良ビルド。
な環境における、DBD::mysqlのインストール。

普通に

$ cpan -i DBD::mysql

とかやっても、

Can't exec "mysql_config": No such file or directory at Makefile.PL line 76.

Cannot find the file 'mysql_config'! Your execution PATH doesn't seem 
not contain the path to mysql_config. Resorting to guessed values!
Can't exec "mysql_config": No such file or directory at Makefile.PL line 466.
Can't exec "mysql_config": No such file or directory at Makefile.PL line 466.
Can't exec "mysql_config": No such file or directory at Makefile.PL line 466.
Can't exec "mysql_config": No such file or directory at Makefile.PL line 466.
Can't exec "mysql_config": No such file or directory at Makefile.PL line 466.
Can't exec "mysql_config": No such file or directory at Makefile.PL line 466.
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
Warning: No success on command[/usr/local/perl5.10.0/bin/perl Makefile.PL]
  CAPTTOFU/DBD-mysql-4.006.tar.gz
  /usr/local/perl5.10.0/bin/perl Makefile.PL -- NOT OK
Running make test
  Make had some problems, won't test
Running make install
  Make had some problems, won't install
Failed during this command:
 CAPTTOFU/DBD-mysql-4.006.tar.gz              : writemakefile NO '/usr/local/perl5.10.0/bin/perl Makefile.PL' returned status 512

とかむっちゃ怒られます。
シンボリックリンクをはってダマしてもいいんですが、perl Makefile.PL するときに--mysql_config=/path/to/mysql_config というオプションが書ける事に今更気づいたのでメモしておきます。

$ perl Makefile.PL --mysql_config=/opt/local/bin/mysql_config5
$ make && make test && make install