First cut for a FreeBSD port - much still not working

third_party/libxml/libxml.gyp

 # Copyright (c) 2009 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'variables': {
     'conditions': [
-      ['OS=="linux"', {'os_include': 'linux'}],
+      ['OS=="linux" or OS=="freebsd"', {'os_include': 'linux'}],
       ['OS=="mac"', {'os_include': 'mac'}],
       ['OS=="win"', {'os_include': 'win32'}],
     ],
     'use_system_libxml%': 0,
   },
   'includes': [
     '../../build/common.gypi',
   ],
   'targets': [
     {
       'target_name': 'libxml',
       'conditions': [
-        ['OS=="linux" and use_system_libxml', {
+        ['(OS=="linux" or OS=="freebsd") and use_system_libxml', {
           'type': 'settings',
           'direct_dependent_settings': {
             'cflags': [
               '<!@(pkg-config --cflags libxml-2.0)',
             ],
             'defines': [
               'USE_SYSTEM_LIBXML',
             ],
           },
           'link_settings': {
@@ skipping 194 matching lines @@
             'libraries': [
               '-ldl',
               '-lm',
             ],
           },
         }],
       ],
     },
   ],
 }