我是新手，学习Perl编程。我对cpan感到困惑，我知道有一千个库支持perl，但是，如何从cpan安装库？IM 在 Linux 中使用 CPAN，当我尝试安装 Switch 时，我收到错误消息
cpan[1]> install Switch
和安装时出错：
Reading '/root/.cpan/Metadata'
Database was generated on Mon, 13 Jan 2014 08:29:02 GMT
Running install for module 'Switch'
Running make for R/RG/RGARCIA/Switch-2.16.tar.gz
Checksum for /root/.cpan/sources/authors/id/R/RG/RGARCIA/Switch-2.16.tar.gz ok
Scanning cache /root/.cpan/build for sizes
............................................................................DONE
CPAN.pm: Building R/RG/RGARCIA/Switch-2.16.tar.gz
Checking if your kit is complete...
Looks good
Writing Makefile for Switch
Writing MYMETA.yml and MYMETA.json
cp Switch.pm blib/lib/Switch.pm
Manifying blib/man3/Switch.3
RGARCIA/Switch-2.16.tar.gz
/usr/bin/make -- OK
'YAML' not installed, will not store persistent state
Running make test
PERL_DL_NONLAZY=1 /usr/bin/perl5.18.1 "-MExtUtils::Command::MM" "-e" "test_harness(0, 'blib/lib', 'blib/arch')" t/*.t
t/given.t ... Failed 2/293 subtests
t/nested.t .. ok
t/switch.t .. ok
Test Summary Report
-------------------
t/given.t (Wstat: 0 Tests: 293 Failed: 2)
Failed tests: 2-3
Files=3, Tests=590, 4 wallclock secs ( 0.31 usr 0.01 sys + 2.38 cusr 0.03 csys = 2.73 CPU)
Result: FAIL
Failed 1/3 test programs. 2/590 subtests failed.
make: *** [test_dynamic] Error 255
RGARCIA/Switch-2.16.tar.gz
/usr/bin/make test -- NOT OK
//hint// to see the cpan-testers results for installing this module, try:
reports RGARCIA/Switch-2.16.tar.gz
Running make install
make test had returned bad status, won't install without force
Failed during this command:
RGARCIA/Switch-2.16.tar.gz : make_test NO
如何安装交换机？谢谢
你做的一切都是对的，但是 Switch 在 Perl 5.13.3 及更高版本上坏了。模块的维护者知道这个问题，并且似乎对修复它不感兴趣。鉴于模块维护不善，即使您确实说服了它安装，在生产代码中使用它似乎也不明智。
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