I'm afraid to reply to this since my last reply has a reputation of -1. =)

I checked @INC for /usr/bin/perl and /usr/local/bin/perl, and they aren't sharing anything.

In regards to the composite test failures I'm getting, I want to clarify that the tests are for PerlMagick, not ImageMagick. I'm not sure if that makes any difference to anyone reading this.

I Googled for the composite test failures that I was getting, but I couldn't find anyone who is having the same problem. I'm thinking that might be because PerlMagick's make install command doesn't do the tests by default, so you could just do:

perl Makefile.PL
make
make install
[download]

And not receive any errors. Maybe the majority of people just do that without testing? I'm not sure. I read somewhere that the composite functions use PNG libraries -- I don't have or need the PNG libraries, so I thought I'd give make install a shot. It installed fine and now use Image::Magick; is working with perl5.8.0 (/usr/bin/perl) and perl 5.8.8 (/usr/local/bin/perl).

Thank you all for your help!