[Bioperl-l] bioperl easy way installation using cpan

[Cristiano Elena]

Hi,
I am a beginner and i am trying to install bioperl via CPAN following the instructions on wiki.
i have a leopard mac 10.6 and perl version 5.10 i have X11 and i also installed fink (but the installation of bioperl wasn't successful trough fink either).

the error that i got at the end of the installation via CPAN is the following:

 SHAWNPW/PostScript-0.06.tar.gz
  /usr/bin/make install  -- OK
Warning (usually harmless): 'YAML' not installed, will not store persistent state
Running Build for C/CJ/CJFIELDS/BioPerl-1.6.1.tar.gz
  Has already been unwrapped into directory /Users/ecristiano/.cpan/build/BioPerl-1.6.1-66fecx
Could not make: cannot resolve circular dependency
Warning (usually harmless): 'YAML' not installed, will not store persistent state
Running Build test
  Can't test without successful make
Running Build install
  Make had returned bad status, install seems impossible
Could not read '/Users/ecristiano/.cpan/build/GraphViz-2.04-f7G5nl/META.yml'. Falling back to other methods to determine prerequisites
Failed during this command:
 MINGYILIU/Bio-ASN1-EntrezGene-1.10-withoutworldwriteables.tar.gz: make NO cannot resolve circular dependency
 CJFIELDS/BioPerl-1.6.1.tar.gz                : make NO cannot resolve circular dependency
 LBROCARD/GraphViz-2.04.tar.gz                : writemakefile NO '/usr/bin/perl Makefile.PL' returned status 512


thanks in advance



Elena