You should install DateTime the same way you installed the other modules:

# from the shell / Terminal window
cpan DateTime
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or within the CPAN shell as

install DateTime
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DateTime needs Params::Validate as a prerequisite and the cpan program will hunt down all these prerequisites for you automatically and install them for you if you let it.

The default CPAN configuration is to ask whether to install prerequisites, but you might want to check that or change it from ask to follow so all prerequisites get installed without asking. Type in the cpan shell:

o conf prerequisites_policy
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check that it's ask or follow and to set the new policy to follow type

o conf prerequisites_policy follow
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Then type

o conf commit
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to save the current configuration if you want it to remain.

These posts pointed me in the write direction. Hopefully, this clarification can help someone else fix this same problem.

To install DateTime on Mac

1. read the original post from Perrmoss and the reply by Corion for background info
2. sudo CPAN
3. go through configuration (if needed) press enter for most options except:
4. choose "follow" for the prerequisite policy (instead of ask)
5. personally, I made the recommended/common choices to some of the options (like UNINST=1)

Now here's the key:

6. Try to install DateTime. Every time you see an error, install the package that's missing by:
• Looking for text along the lines of

Can't locate Params/Validate.pm in @INC (@INC

or

Can't locate DateTime/Locale.pm in @INC (@INC

• Take the "Params/Validate.pm" part and convert it to Params::Validate
• and run the corresponding command in CPAN: install Params::Validate

For me to get the DateTime module to install I had to run the following, first:

install Params::Validate

install DateTime::Locale

install DateTime::TimeZone

Keep following that pattern and you'll get it installed, finally!!!

In addition to everything I wrote above, I also needed to run install Test::Exception

So the final, full list of everything I command I ran to install DateTime on my MacBook Pro OS X 10.5.8, that has never before used perl

1. sudo CPAN (press enter lots of times to config)
2. install Params::Validate
3. install DateTime::Locale
4. install DateTime::TimeZone
5. install Test::Exception
6. install Test::Warn
7. install DateTime::Format::ICal

and FINALLY:

8. install DateTime

Sadly, I have no idea what I just did. All I know is it worked for me and I moved on to successfully finish setting up bugzilla.

I hope this helps someone else out there (the way the posts in this thread lead me to figure this thing out)

- Kevin G. a.k.a. gMale

I had expected that to be true as well, but when I tried installing a pure Perl module on a Mac OS X, I found that with the default installation the error

make: *** No rule to make target 
`/System/Library/Perl/5.8.6/darwin-thread-multi-2level/CORE/config.h',
+  needed by `Makefile'.  Stop.
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arose. This was fixed by installing the Xcode package, which contains the C compiler.

Xcode contains more than just a compiler. In fact, if you just installed GCC, it wouldn't work.

The actual item needed is the 'BSD Subsystem', which contains the necessary header files.

Is that the output from running the Makefile.PL ?

It looks to me more like something you would get from running 'make' ... when the build of perl doesn't include config.h (as is often the case with non-devel perl installations on nix-like systems).

But I don't have Mac OS X, so I should really just shut up. (Besides, I think I might have shifted from trying to make minor corrections, to trying to split hairs :-)

Cheers,
Rob