[prasanna@XML-LibXML-1.40]$ /opt/ActivePerl-5.12/bin/perl Makefile.PL
enable native perl UTF8
running xml2-config... failed
using fallback values for LIBS and INC
options:
  LIBS='-L/usr/local/lib -L/usr/lib -lxml2 -lz -lm'
  INC='-I/usr/local/include -I/usr/include'
If this is wrong, Re-run as:
  $ /opt/ActivePerl-5.12/bin/perl-static Makefile.PL LIBS='-L/path/to/lib' INC='-I/path/to/include'

looking for -lxml2... no
libxml2 not found
Try setting LIBS and INC values on the command line
Or get libxml2 from
  http://www.libxml.org/
If you install via RPMs, make sure you also install the -devel
RPMs, as this is where the headers (.h files) are.