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$ perl -V

This is perl 5, version 18, subversion 0 (v5.18.0) built for x86_64-linux

  Built under linux
  Compiled at May 19 2013 20:26:15
  %ENV:
    PERLBREW_BASHRC_VERSION="0.63"
    PERLBREW_HOME="/home/explorer/.perlbrew"
    PERLBREW_MANPATH="/home/explorer/perl5/perlbrew/perls/perl-5.18.0/man"
    PERLBREW_PATH="/home/explorer/perl5/perlbrew/bin:/home/explorer/perl5/perlbrew/perls/perl-5.18.0/bin"
    PERLBREW_PERL="perl-5.18.0"
    PERLBREW_ROOT="/home/explorer/perl5/perlbrew"
    PERLBREW_VERSION="0.63"
    PERLDOC_POD2="1"
  @INC:
    /home/explorer/perl5/perlbrew/perls/perl-5.18.0/lib/site_perl/5.18.0/x86_64-linux
    /home/explorer/perl5/perlbrew/perls/perl-5.18.0/lib/site_perl/5.18.0
    /home/explorer/perl5/perlbrew/perls/perl-5.18.0/lib/5.18.0/x86_64-linux
    /home/explorer/perl5/perlbrew/perls/perl-5.18.0/lib/5.18.0
    .

$ perlbrew install-cpanm

/home/explorer/perl5/perlbrew/bin/cpanm already exists, are you sure to override ? [y/N] [N] y

cpanm is installed to

    /home/explorer/perl5/perlbrew/bin/cpanm

$ cpanm XML::XPath
--> Working on XML::XPath
Fetching http://www.cpan.org/authors/id/M/MS/MSE ... .13.tar.gz ... OK
Configuring XML-XPath-1.13 ... OK
==> Found dependencies: XML::Parser
--> Working on XML::Parser
Fetching http://www.cpan.org/authors/id/T/TO/TOD ... .41.tar.gz ... OK
Configuring XML-Parser-2.41 ... OK
Building and testing XML-Parser-2.41 ... FAIL
! Installing XML::Parser failed. See /home/explorer/.cpanm/work/1383593279.19012/build.log for details. Retry with --force to force install it.
! Installing the dependencies failed: Module 'XML::Parser' is not installed
! Bailing out the installation for XML-XPath-1.13.

$ less /home/explorer/.cpanm/work/1383593279.19012/build.log
...
Expat must be installed prior to building XML::Parser and I can't find
it in the standard library directories. Install 'expat-devel' package with your
OS package manager. See 'README'.

Or you can download expat from:

http://sourceforge.net/projects/expat/

If expat is installed, but in a non-standard directory, then use the
following options to Makefile.PL:

    EXPATLIBPATH=...  To set the directory in which to find libexpat

    EXPATINCPATH=...  To set the directory in which to find expat.h

For example:

    perl Makefile.PL EXPATLIBPATH=/home/me/lib EXPATINCPATH=/home/me/include

Note that if you build against a shareable library in a non-standard location
you may (on some platforms) also have to set your LD_LIBRARY_PATH environment
variable at run time for perl to find the library.
...
/var/home/explorer/perl5/perlbrew/perls/perl-5.18.0/bin/perl /var/home/explorer/perl5/perlbrew/perls/perl-5.18.0/lib/5.18.0/ExtUtils/xsubpp -noprototypes -typemap /home/explorer/perl5/perlbrew/perls/perl-5.18.0/lib/5.18.0/ExtUtils/typemap -typemap typemap  Expat.xs > Expat.xsc && mv Expat.xsc Expat.c
cc -c   -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -O2   -DVERSION=\"2.41\" -DXS_VERSION=\"2.41\" -fPIC "-I/home/explorer/perl5/perlbrew/perls/perl-5.18.0/lib/5.18.0/x86_64-linux/CORE"   Expat.cExpat.xs:12:19: fatal error: expat.h: No existe el fichero o el directorio
...

$ su -
Contraseña: ************
# apt-get install libexpat1
# apt-get install libexpat1-dev
# exit

$ cpanm XML::XPath
--> Working on XML::XPath
Fetching http://www.cpan.org/authors/id/M/MS/MSE ... .13.tar.gz ... OK
Configuring XML-XPath-1.13 ... OK
==> Found dependencies: XML::Parser
--> Working on XML::Parser
Fetching http://www.cpan.org/authors/id/T/TO/TOD ... .41.tar.gz ... OK
Configuring XML-Parser-2.41 ... OK
Building and testing XML-Parser-2.41 ... OK
Successfully installed XML-Parser-2.41
Building and testing XML-XPath-1.13 ... OK
Successfully installed XML-XPath-1.13
2 distributions installed

$ perl -MXML::XPath -E 1
$