brew install libxml2
Updating Homebrew...
==> Auto-updated Homebrew!
Updated 1 tap (homebrew/core).
==> Updated Formulae
Updated 19 formulae.

Warning: libxml2 2.9.10_2 is already installed and up-to-date
To reinstall 2.9.10_2, run `brew reinstall libxml2`

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# PATH
PATH="/usr/local/Cellar/libxml2/2.9.10_2/bin:$PATH"
export PATH

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cpanm XML::LibXML
--> Working on XML::LibXML
Fetching http://www.cpan.org/authors/id/S/SH/SHLOMIF/XML-LibXML-2.0206.tar.gz ... OK
Configuring XML-LibXML-2.0206 ... OK
Building and testing XML-LibXML-2.0206 ... FAIL
! Installing XML::LibXML failed. See /Users/root/.cpanm/work/1607108755.33137/build.log for details. Retry with --force to force install it.

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Can't load '/Users/root/.cpanm/work/1607108755.33137/XML-LibXML-2.0206/blib/arch/auto/XML/LibXML/LibXML.bundle' for module XML::LibXML: dlopen(/Users/root/.cpanm/work/1607108755.33137/XML-LibXML-2.0206/blib/arch/auto/XML/LibXML/LibXML.bundle, 2): Symbol not found: _xmlFree
  Referenced from: /Users/root/.cpanm/work/1607108755.33137/XML-LibXML-2.0206/blib/arch/auto/XML/LibXML/LibXML.bundle
  Expected in: flat namespace
 in /Users/root/.cpanm/work/1607108755.33137/XML-LibXML-2.0206/blib/arch/auto/XML/LibXML/LibXML.bundle at /Users/root/perl5/perlbrew/perls/perl-5.28.2/lib/5.28.2/darwin-2level/DynaLoader.pm line 197.
&#65533; at /Users/root/.cpanm/work/1607108755.33137/XML-LibXML-2.0206/blib/lib/XML/LibXML.pm line 156.
BEGIN failed--compilation aborted at /Users/root/.cpanm/work/1607108755.33137/XML-LibXML-2.0206/blib/lib/XML/LibXML.pm line 156.
Compilation failed in require at t/01basic.t line 6.
BEGIN failed--compilation aborted at t/01basic.t line 6.
# Looks like your test exited with 2 before it could output anything.
t/01basic.t ........................................ 
Dubious, test returned 2 (wstat 512, 0x200)
Failed 3/3 subtests 
Can't load '/Users/root/.cpanm/work/1607108755.33137/XML-LibXML-2.0206/blib/arch/auto/XML/LibXML/LibXML.bundle' for module XML::LibXML: dlopen(/Users/root/.cpanm/work/1607108755.33137/XML-LibXML-2.0206/blib/arch/auto/XML/LibXML/LibXML.bundle, 2): Symbol not found: _xmlFree
  Referenced from: /Users/root/.cpanm/work/1607108755.33137/XML-LibXML-2.0206/blib/arch/auto/XML/LibXML/LibXML.bundle
  Expected in: flat namespace
 in /Users/root/.cpanm/work/1607108755.33137/XML-LibXML-2.0206/blib/arch/auto/XML/LibXML/LibXML.bundle at /Users/root/perl5/perlbrew/perls/perl-5.28.2/lib/5.28.2/darwin-2level/DynaLoader.pm line 197.
&#65533; at /Users/root/.cpanm/work/1607108755.33137/XML-LibXML-2.0206/blib/lib/XML/LibXML.pm line 156.
BEGIN failed--compilation aborted at /Users/root/.cpanm/work/1607108755.33137/XML-LibXML-2.0206/blib/lib/XML/LibXML.pm line 156.
Compilation failed in require at /Users/root/.cpanm/work/1607108755.33137/XML-LibXML-2.0206/blib/lib/XML/LibXML/Common.pm line 29.
BEGIN failed--compilation aborted at /Users/root/.cpanm/work/1607108755.33137/XML-LibXML-2.0206/blib/lib/XML/LibXML/Common.pm line 29.
Compilation failed in require at t/02parse.t line 20.
BEGIN failed--compilation aborted at t/02parse.t line 20.
# Looks like your test exited with 2 before it could output anything.
t/02parse.t ........................................ 
Dubious, test returned 2 (wstat 512, 0x200)
Failed 533/533 subtests