使用PERL時最煩人的就是遇到沒有安裝的模組，例如：
Can't locate DBD/mysql.pm in @INC (you may need to install the DBD::mysql module) (@INC contains: /…) at xxx.pl line xx.
在freebsd 11上要安裝pel module，有幾種方式，如cpan, cpanm。
使用pkg安裝
最方便的還是用pkg來裝
列出包含關鍵字的可用模組
例如要列出有關鍵字DBD的模組，使用pkg search DBD
p5-AnyEvent-DBD-Pg-0.03_2 Perl extension for AnyEvent interface to DBD::Pg async interface
p5-DBD-AnyData-0.110_1 DBI access to XML, CSV, and other formats
p5-DBD-CSV-0.54,1 DBI driver for CSV files
p5-DBD-Excel-0.06_1 Class for DBI drivers that acts on Excel files
p5-DBD-Google-0.51_2 Treat Google as a datasource for DBI
p5-DBD-InterBase-0.48_3 DBI driver for InterBase/Firebird/Yaffil RDBMS server
p5-DBD-LDAP-1.00 DBI interface for accessing LDAP servers
p5-DBD-Mock-1.45_1 Simple mock DBD implementation used for testing
p5-DBD-Multi-0.16_1 Manage Multiple Data Sources with Failover and Load Balancing
p5-DBD-ODBC-1.60 DBD module interfacing the ODBC databases
p5-DBD-Pg-3.7.4_1 Provides access to PostgreSQL databases through the DBI
p5-DBD-PgLite-0.11_2 PostgreSQL emulation mode for SQLite
p5-DBD-PgPP-0.08_1 Pure Perl PostgreSQL driver for the DBI
p5-DBD-SQLite-1.62 Provides access to SQLite3 databases through the DBI
p5-DBD-SQLite2-0.38 Provides access to SQLite2 databases through the DBI
p5-DBD-Sybase-1.16 Sybase DBI driver for Perl 5
p5-DBD-XBase-1.08 Provides access to XBase (dBase, Fox*) database files through DBI
p5-DBD-cego-1.4.0 Cego DBI driver for Perl 5
p5-DBD-mysql-4.050 MySQL driver for the Perl5 Database Interface (DBI)
p5-DBIx-AnyDBD-2.01_1 DBD independent class
rubygem-dbd-mysql-0.4.4_1 MySQL driver for DBI-for-Ruby
rubygem-dbd-pg-0.3.9_3 PostgreSQL driver for DBI-for-Ruby
rubygem-dbd-sqlite3-1.2.5_1 SQLite3 driver for DBI-for-Ruby
這裡會列出很多，你只需要安裝你需要的模組即可
安裝
這樣就可以了
使用CPANM
安裝 cpanm
# pkg search cpanm
p5-App-cpanminus-1.7042 Perl extension to get, unpack, build, and install modules from CPAN
p5-App-cpanminus-reporter-0.17 Perl extension to send cpanm output to CPAN Testers database
# pkg install p5-App-cpanminus-1.7042
安裝模組
# cpanm DBD::MariaDB
注意！用pkg有時會刪除一些衝突的套件
pkg雖然方便，但使用pkg安裝時有時會因為套件不相容，他會列出要刪除的套件，請不要都不看一直按Y，
然後刪了套件都不知道，因為我就幹過這種事，然後才發現套件被我自己刪了。
一開始我還懷疑被同事刪掉什麼的，原來是我自己白痴啊
例如
# pkg install p5-DBD-mysql
Updating FreeBSD repository catalogue...
FreeBSD repository is up to date.
All repositories are up to date.
Checking integrity... done (1 conflicting)
- mysql56-client-5.6.44 conflicts with mariadb103-client-10.3.13_1 on /usr/local/bin/msql2mysql
Checking integrity... done (0 conflicting)
The following 4 package(s) will be affected (of 0 checked):
Installed packages to be REMOVED: <== 提示你會刪除套件
mariadb103-client-10.3.13_1
mariadb103-server-10.3.13 <== 把你的server刪掉
New packages to be INSTALLED:
p5-DBD-mysql: 4.050
mysql56-client: 5.6.44 <== 但是只裝client不裝server
Number of packages to be removed: 2
Number of packages to be installed: 2
The operation will free 200 MiB.
Proceed with this action? [y/N]: n <== 上面要看清楚才按 y