Since we're only using it on Linux now, just require poppler as a system dependency.

gyp/fontconfig.gyp

-# GYP for fontconfig (
-#
-# This has been tested on Windows and Mac.
-# This library is native to Linux, so build from source is not necessary.
-#
-# Additional files for building under Windows are provided here: (LGPL)
-# http://comments.gmane.org/gmane.comp.fonts.fontconfig/4438
-
-{
-  'variables': {
-    'skia_warnings_as_errors': 0,
-  },
-  'targets': [
-    {
-      'target_name': 'fontconfig',
-      'type': 'none',
-      'dependencies': [
-        'libfontconfig',
-      ],
-      'direct_dependent_settings': {
-        'include_dirs': [
-          '../third_party/externals/fontconfig',
-        ],
-      },
-      'conditions': [
-        ['skia_os == "mac"', {
-          'dependencies': [
-            'fontconfig_setup',
-          ],
-        }],
-      ],
-    },
-    {
-      'target_name': 'libfontconfig',
-      'type': 'static_library',
-      'dependencies': [
-        'freetype.gyp:freetype_poppler',
-      ],
-      'include_dirs' : [
-        '../third_party/externals/fontconfig',
-        '../third_party/fontconfig/config',
-        '../third_party/fontconfig/config/src',
-      ],
-      'sources': [
-        '../third_party/externals/fontconfig/src/fcatomic.c',
-        '../third_party/externals/fontconfig/src/fcblanks.c',
-        '../third_party/externals/fontconfig/src/fccache.c',
-        '../third_party/externals/fontconfig/src/fccfg.c',
-        '../third_party/externals/fontconfig/src/fccharset.c',
-        '../third_party/externals/fontconfig/src/fccompat.c',
-        '../third_party/externals/fontconfig/src/fcdbg.c',
-        '../third_party/externals/fontconfig/src/fcdefault.c',
-        '../third_party/externals/fontconfig/src/fcdir.c',
-        '../third_party/externals/fontconfig/src/fcfreetype.c',
-        '../third_party/externals/fontconfig/src/fcfs.c',
-        '../third_party/externals/fontconfig/src/fchash.c',
-        '../third_party/externals/fontconfig/src/fcinit.c',
-        '../third_party/externals/fontconfig/src/fclang.c',
-        '../third_party/externals/fontconfig/src/fclist.c',
-        '../third_party/externals/fontconfig/src/fcmatch.c',
-        '../third_party/externals/fontconfig/src/fcmatrix.c',
-        '../third_party/externals/fontconfig/src/fcname.c',
-        '../third_party/externals/fontconfig/src/fcobjs.c',
-        '../third_party/externals/fontconfig/src/fcpat.c',
-        '../third_party/externals/fontconfig/src/fcserialize.c',
-        '../third_party/externals/fontconfig/src/fcstat.c',
-        '../third_party/externals/fontconfig/src/fcstr.c',
-        '../third_party/externals/fontconfig/src/fcxml.c',
-        '../third_party/externals/fontconfig/src/ftglue.c',
-      ],
-      'defines': [
-        'HAVE_CONFIG_H',
-      ],
-      'cflags': [
-        '-fPIC',
-      ],
-
-      'direct_dependent_settings': {
-        'include_dirs': [
-          '../third_party/externals/fontconfig',
-        ],
-      },
-
-      'conditions': [
-        ['skia_os == "mac"', {
-          'include_dirs': [
-            '<(SHARED_INTERMEDIATE_DIR)/fontconfig_config',
-            '../third_party/fontconfig/config/mac',
-            '../third_party/fontconfig/config/mac/src',
-          ],
-          'dependencies': [
-            'fontconfig_config_template',
-          ],
-          'libraries': [
-            '$(SDKROOT)/usr/lib/libexpat.dylib',
-          ],
-          'xcode_settings': {
-            'DYLIB_INSTALL_NAME_BASE': '@executable_path',
-          },
-        }],
-        ['skia_os == "win"', {
-          'include_dirs': [
-            '../third_party/fontconfig/config/windows',
-            '../third_party/fontconfig/config/windows/src',
-          ],
-          'sources!': [
-            '../third_party/externals/fontconfig/src/fccompat.c',
-            '../third_party/externals/fontconfig/src/fcxml.c',
-          ],
-          'defines': [
-            # inline is not recognized  in C and has to be __inline
-            'inline=__inline',
-          ],
-        }],
-      ],
-    },
-  ],
-  'conditions': [
-    ['skia_os == "mac"', {
-      'variables': {
-        'cachedir': '<(PRODUCT_DIR)/fontconfig/cache',
-        'configdir': '<(PRODUCT_DIR)/fontconfig/etc',
-      },
-      'targets': [
-        {
-          'target_name': 'fontconfig_config_template',
-          'type': 'none',
-          'actions': [{
-            'action_name': 'fontconfig_config_template',
-            'message': 'Generating fontconfig header',
-            'inputs': [
-              '../third_party/fontconfig/process-template.py',
-              '../third_party/fontconfig/config/mac/config.h.template',
-            ],
-            'outputs': [
-              '<(SHARED_INTERMEDIATE_DIR)/fontconfig_config/config.h',
-            ],
-            'action': [
-              'python', '../third_party/fontconfig/process-template.py',
-              '-i', '../third_party/fontconfig/config/mac/config.h.template',
-              '-o', '<@(_outputs)',
-              '-p', '@FC_CACHEDIR@', '<(cachedir)',
-              '-p', '@FONTCONFIG_PATH@', '<(configdir)',
-            ],
-          }],
-        }, {
-          'target_name': 'fontconfig_setup',
-          'type': 'none',
-          'dependencies': [
-            'fc-cache',
-          ],
-          'actions': [{
-            'action_name': 'fontconfig_config_file',
-            'message': 'Generating font.conf',
-            'inputs': [
-              '../third_party/fontconfig/process-template.py',
-              '../third_party/externals/fontconfig/fonts.conf.in',
-            ],
-            'outputs': [ '<(configdir)/fonts.conf', ],
-            'action': [
-              'python', '../third_party/fontconfig/process-template.py',
-              '-i', '../third_party/externals/fontconfig/fonts.conf.in',
-              '-o', '<(configdir)/fonts.conf',
-              '-p', '@FC_CACHEDIR@', '<(cachedir)',
-              '-k', '@FC_DEFAULT_FONTS@', '/System/Library/Fonts',
-              '-k', '@FC_FONTPATH@', '<dir>/Library/Fonts</dir>',
-              '-p', '@CONFIGDIR@', '<(configdir)/conf.d',
-              '-k', '@PACKAGE@', 'fontconfig',
-              '-k', '@VERSION@', '2.11.0',
-            ],
-          }, {
-            'action_name': 'populate_fontconfig_cache',
-            'message':
-              'Generating fontconfig cache (this will take a few minutes).',
-            'inputs': [
-              '<(PRODUCT_DIR)/fc-cache',
-              '<(configdir)/fonts.conf',
-            ],
-            'outputs': [ '<(cachedir)/CACHEDIR.TAG', ],
-            'action': [ '<(PRODUCT_DIR)/fc-cache', '-s', '-f', '-v', ],
-          }],
-        },
-        {
-          'target_name': 'fc-cache',
-          'type': 'executable',
-          'dependencies': [
-            'libfontconfig',
-          ],
-          'libraries':[
-            '$(SDKROOT)/usr/lib/libexpat.dylib',
-          ],
-          'sources': [
-            '../third_party/externals/fontconfig/fc-cache/fc-cache.c',
-          ],
-        },
-      ],
-    }],
-  ],
-}