https://github.com/google/mozc/issues/490

--- /src/base/absl.gyp
+++ /src/base/absl.gyp
@@ -28,119 +28,209 @@
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 {
-  'variables': {
-    'absl_srcdir': '<(DEPTH)/third_party/abseil-cpp/absl',
-    'gen_absl_dir': '<(SHARED_INTERMEDIATE_DIR)/third_party/abseil-cpp/absl',
-  },
+  'conditions': [
+    ['use_system_abseil_cpp==0', {
+      'variables': {
+        'absl_srcdir': '<(DEPTH)/third_party/abseil-cpp/absl',
+        'gen_absl_dir': '<(SHARED_INTERMEDIATE_DIR)/third_party/abseil-cpp/absl',
+      },
+    }],
+  ],
   'targets': [
     {
       'target_name': 'absl_base',
-      'type': 'static_library',
       'toolsets': ['host', 'target'],
-      'sources': [
-        '<(absl_srcdir)/base/internal/cycleclock.cc',
-        '<(absl_srcdir)/base/internal/low_level_alloc.cc',
-        '<(absl_srcdir)/base/internal/raw_logging.cc',
-        '<(absl_srcdir)/base/internal/spinlock.cc',
-        '<(absl_srcdir)/base/internal/spinlock_wait.cc',
-        '<(absl_srcdir)/base/internal/sysinfo.cc',
-        '<(absl_srcdir)/base/internal/thread_identity.cc',
-        '<(absl_srcdir)/base/internal/throw_delegate.cc',
-        '<(absl_srcdir)/base/internal/unscaledcycleclock.cc',
-        '<(absl_srcdir)/container/internal/raw_hash_set.cc',
-        '<(absl_srcdir)/hash/internal/city.cc',
-        '<(absl_srcdir)/hash/internal/hash.cc',
-      ],
-      'msvs_disabled_warnings': [
-        # 'type' : forcing value to bool 'true' or 'false'
-        # (performance warning)
-        # http://msdn.microsoft.com/en-us/library/b6801kcy.aspx
-        '4800',
+      'conditions': [
+        ['use_system_abseil_cpp==1', {
+          'type': 'none',
+          'all_dependent_settings': {
+            'link_settings': {
+              'libraries': [
+                '-labsl_base -labsl_city -labsl_hash -labsl_malloc_internal -labsl_raw_hash_set -labsl_raw_logging_internal -labsl_spinlock_wait -labsl_throw_delegate',
+              ],
+            },
+          },
+        }, {
+          'type': 'static_library',
+          'sources': [
+            # libabsl_base
+            '<(absl_srcdir)/base/internal/cycleclock.cc',
+            # libabsl_malloc_internal
+            '<(absl_srcdir)/base/internal/low_level_alloc.cc',
+            # libabsl_raw_logging_internal
+            '<(absl_srcdir)/base/internal/raw_logging.cc',
+            # libabsl_base
+            '<(absl_srcdir)/base/internal/spinlock.cc',
+            # libabsl_spinlock_wait
+            '<(absl_srcdir)/base/internal/spinlock_wait.cc',
+            # libabsl_base
+            '<(absl_srcdir)/base/internal/sysinfo.cc',
+            '<(absl_srcdir)/base/internal/thread_identity.cc',
+            # libabsl_throw_delegate
+            '<(absl_srcdir)/base/internal/throw_delegate.cc',
+            # libabsl_base
+            '<(absl_srcdir)/base/internal/unscaledcycleclock.cc',
+            # libabsl_raw_hash_set
+            '<(absl_srcdir)/container/internal/raw_hash_set.cc',
+            # libabsl_city
+            '<(absl_srcdir)/hash/internal/city.cc',
+            # libabsl_hash
+            '<(absl_srcdir)/hash/internal/hash.cc',
+          ],
+          'msvs_disabled_warnings': [
+            # 'type' : forcing value to bool 'true' or 'false'
+            # (performance warning)
+            # http://msdn.microsoft.com/en-us/library/b6801kcy.aspx
+            '4800',
+          ],
+        }],
       ],
     },
     {
       'target_name': 'absl_numeric',
-      'type': 'static_library',
       'toolsets': ['host', 'target'],
-      'sources': [
-        '<(absl_srcdir)/numeric/int128.cc',
-      ],
-      'dependencies': [
-        'absl_base',
+      'conditions': [
+        ['use_system_abseil_cpp==1', {
+          'type': 'none',
+          'all_dependent_settings': {
+            'link_settings': {
+              'libraries': [
+                '-labsl_int128',
+              ],
+            },
+          },
+        }, {
+          'type': 'static_library',
+          'sources': [
+            # libabsl_int128
+            '<(absl_srcdir)/numeric/int128.cc',
+          ],
+          'dependencies': [
+            'absl_base',
+          ],
+        }],
       ],
     },
     {
       'target_name': 'absl_strings_internal',
-      'type': 'static_library',
       'toolsets': ['host', 'target'],
-      'sources': [
-        '<(absl_srcdir)/strings/internal/charconv_bigint.cc',
-        '<(absl_srcdir)/strings/internal/charconv_parse.cc',
-        '<(absl_srcdir)/strings/internal/escaping.cc',
-        '<(absl_srcdir)/strings/internal/memutil.cc',
-        '<(absl_srcdir)/strings/internal/str_format/arg.cc',
-        '<(absl_srcdir)/strings/internal/str_format/bind.cc',
-        '<(absl_srcdir)/strings/internal/str_format/extension.cc',
-        '<(absl_srcdir)/strings/internal/str_format/float_conversion.cc',
-        '<(absl_srcdir)/strings/internal/str_format/output.cc',
-        '<(absl_srcdir)/strings/internal/str_format/parser.cc',
-        '<(absl_srcdir)/strings/internal/utf8.cc',
-      ],
-      'dependencies': [
-        'absl_base',
-        'absl_numeric',
+      'conditions': [
+        ['use_system_abseil_cpp==1', {
+          'type': 'none',
+          'all_dependent_settings': {
+            'link_settings': {
+              'libraries': [
+                '-labsl_strings_internal',
+              ],
+            },
+          },
+        }, {
+          'type': 'static_library',
+          'sources': [
+            # libabsl_strings
+            '<(absl_srcdir)/strings/internal/charconv_bigint.cc',
+            '<(absl_srcdir)/strings/internal/charconv_parse.cc',
+            # libabsl_strings_internal
+            '<(absl_srcdir)/strings/internal/escaping.cc',
+            # libabsl_strings
+            '<(absl_srcdir)/strings/internal/memutil.cc',
+            # libabsl_str_format_internal
+            '<(absl_srcdir)/strings/internal/str_format/arg.cc',
+            '<(absl_srcdir)/strings/internal/str_format/bind.cc',
+            '<(absl_srcdir)/strings/internal/str_format/extension.cc',
+            '<(absl_srcdir)/strings/internal/str_format/float_conversion.cc',
+            '<(absl_srcdir)/strings/internal/str_format/output.cc',
+            '<(absl_srcdir)/strings/internal/str_format/parser.cc',
+            # libabsl_strings_internal
+            '<(absl_srcdir)/strings/internal/utf8.cc',
+          ],
+          'dependencies': [
+            'absl_base',
+            'absl_numeric',
+          ],
+        }],
       ],
     },
     {
       'target_name': 'absl_strings',
-      'type': 'static_library',
       'toolsets': ['host', 'target'],
-      'sources': [
-        '<(absl_srcdir)/strings/ascii.cc',
-        '<(absl_srcdir)/strings/charconv.cc',
-        '<(absl_srcdir)/strings/escaping.cc',
-        '<(absl_srcdir)/strings/match.cc',
-        '<(absl_srcdir)/strings/numbers.cc',
-        '<(absl_srcdir)/strings/str_cat.cc',
-        '<(absl_srcdir)/strings/str_replace.cc',
-        '<(absl_srcdir)/strings/str_split.cc',
-        '<(absl_srcdir)/strings/string_view.cc',
-        '<(absl_srcdir)/strings/substitute.cc',
-      ],
-      'dependencies': [
-        'absl_base',
-        'absl_numeric',
-        'absl_strings_internal',
+      'conditions': [
+        ['use_system_abseil_cpp==1', {
+          'type': 'none',
+          'all_dependent_settings': {
+            'link_settings': {
+              'libraries': [
+                '-labsl_str_format_internal -labsl_strings -labsl_strings_internal',
+              ],
+            },
+          },
+        }, {
+          'type': 'static_library',
+          'sources': [
+            # libabsl_strings
+            '<(absl_srcdir)/strings/ascii.cc',
+            '<(absl_srcdir)/strings/charconv.cc',
+            '<(absl_srcdir)/strings/escaping.cc',
+            '<(absl_srcdir)/strings/match.cc',
+            '<(absl_srcdir)/strings/numbers.cc',
+            '<(absl_srcdir)/strings/str_cat.cc',
+            '<(absl_srcdir)/strings/str_replace.cc',
+            '<(absl_srcdir)/strings/str_split.cc',
+            '<(absl_srcdir)/strings/string_view.cc',
+            '<(absl_srcdir)/strings/substitute.cc',
+          ],
+          'dependencies': [
+            'absl_base',
+            'absl_numeric',
+            'absl_strings_internal',
+          ],
+        }],
       ],
     },
     {
       'target_name': 'absl_time',
-      'type': 'static_library',
       'toolsets': ['host', 'target'],
-      'sources': [
-        '<(absl_srcdir)/time/civil_time.cc',
-        '<(absl_srcdir)/time/clock.cc',
-        '<(absl_srcdir)/time/duration.cc',
-        '<(absl_srcdir)/time/format.cc',
-        '<(absl_srcdir)/time/time.cc',
-        '<(absl_srcdir)/time/internal/cctz/src/civil_time_detail.cc',
-        '<(absl_srcdir)/time/internal/cctz/src/time_zone_fixed.cc',
-        '<(absl_srcdir)/time/internal/cctz/src/time_zone_format.cc',
-        '<(absl_srcdir)/time/internal/cctz/src/time_zone_if.cc',
-        '<(absl_srcdir)/time/internal/cctz/src/time_zone_impl.cc',
-        '<(absl_srcdir)/time/internal/cctz/src/time_zone_info.cc',
-        '<(absl_srcdir)/time/internal/cctz/src/time_zone_libc.cc',
-        '<(absl_srcdir)/time/internal/cctz/src/time_zone_lookup.cc',
-        '<(absl_srcdir)/time/internal/cctz/src/time_zone_posix.cc',
-        '<(absl_srcdir)/time/internal/cctz/src/zone_info_source.cc',
-      ],
-      'cflags': [
-        '-Wno-error',
-      ],
-      'dependencies': [
-        'absl_base',
-        'absl_numeric',
-        'absl_strings_internal',
+      'conditions': [
+        ['use_system_abseil_cpp==1', {
+          'type': 'none',
+          'all_dependent_settings': {
+            'link_settings': {
+              'libraries': [
+                '-labsl_civil_time -labsl_time -labsl_time_zone',
+              ],
+            },
+          },
+        }, {
+          'type': 'static_library',
+          'sources': [
+            # libabsl_time
+            '<(absl_srcdir)/time/civil_time.cc',
+            '<(absl_srcdir)/time/clock.cc',
+            '<(absl_srcdir)/time/duration.cc',
+            '<(absl_srcdir)/time/format.cc',
+            '<(absl_srcdir)/time/time.cc',
+            # libabsl_civil_time
+            '<(absl_srcdir)/time/internal/cctz/src/civil_time_detail.cc',
+            # libabsl_time_zone
+            '<(absl_srcdir)/time/internal/cctz/src/time_zone_fixed.cc',
+            '<(absl_srcdir)/time/internal/cctz/src/time_zone_format.cc',
+            '<(absl_srcdir)/time/internal/cctz/src/time_zone_if.cc',
+            '<(absl_srcdir)/time/internal/cctz/src/time_zone_impl.cc',
+            '<(absl_srcdir)/time/internal/cctz/src/time_zone_info.cc',
+            '<(absl_srcdir)/time/internal/cctz/src/time_zone_libc.cc',
+            '<(absl_srcdir)/time/internal/cctz/src/time_zone_lookup.cc',
+            '<(absl_srcdir)/time/internal/cctz/src/time_zone_posix.cc',
+            '<(absl_srcdir)/time/internal/cctz/src/zone_info_source.cc',
+          ],
+          'cflags': [
+            '-Wno-error',
+          ],
+          'dependencies': [
+            'absl_base',
+            'absl_numeric',
+            'absl_strings_internal',
+          ],
+        }],
       ],
     },
   ],
--- /src/config/config_test.gyp
+++ /src/config/config_test.gyp
@@ -36,6 +36,7 @@
         'config_handler_test.cc',
       ],
       'dependencies': [
+        '../base/absl.gyp:absl_base',
         '../testing/testing.gyp:gtest_main',
         '../testing/testing.gyp:mozctest',
         'config.gyp:config_handler',
@@ -80,6 +81,7 @@
         'character_form_manager_test.cc',
       ],
       'dependencies': [
+        '../base/absl.gyp:absl_base',
         '../testing/testing.gyp:gtest_main',
         'config.gyp:character_form_manager',
       ],
--- /src/gyp/common.gypi
+++ /src/gyp/common.gypi
@@ -194,7 +194,13 @@
     'include_dirs': [
       '<(abs_depth)',
       '<(SHARED_INTERMEDIATE_DIR)',
-      '<(absl_dir)',
+    ],
+    'conditions': [
+      ['use_system_abseil_cpp==0', {
+        'include_dirs': [
+          '<(absl_dir)',
+        ],
+      }],
     ],
     'mac_framework_headers': [],
     'target_conditions': [
--- /src/gyp/common_win.gypi
+++ /src/gyp/common_win.gypi
@@ -307,10 +307,16 @@
     'include_dirs': [
       '<(abs_depth)',
       '<(SHARED_INTERMEDIATE_DIR)',
-      '<(absl_dir)',
       '<@(msvs_includes)',
       '<(wtl_dir)/include',
     ],
+    'conditions': [
+      ['use_system_abseil_cpp==0', {
+        'include_dirs': [
+          '<(absl_dir)',
+        ],
+      }],
+    ],
     'msvs_configuration_attributes': {
       'CharacterSet': '<(win_char_set_unicode)',
     },
--- /src/gyp/defines.gypi
+++ /src/gyp/defines.gypi
@@ -63,6 +63,10 @@
     # use_libibus represents if ibus library is used or not.
     # This option is only for Linux.
     'use_libibus%': '0',
+
+    # use_system_abseil_cpp represents if system version or bundled version
+    # of abseil-cpp library is used.
+    'use_system_abseil_cpp%': '0',
   },
   'target_defaults': {
     'defines': [
--- /src/gyp/directories.gypi
+++ /src/gyp/directories.gypi
@@ -31,7 +31,12 @@
   'variables': {
     # Top directory of third party libraries.
     'third_party_dir': '<(DEPTH)/third_party',
-    'absl_dir': '<(DEPTH)/third_party/abseil-cpp',
+
+    'conditions': [
+      ['use_system_abseil_cpp==0', {
+        'absl_dir': '<(DEPTH)/third_party/abseil-cpp',
+      }],
+    ],
 
     # Top directory of additional third party libraries.
     'ext_third_party_dir%': '<(abs_depth)/third_party',
--- /src/session/session_test.gyp
+++ /src/session/session_test.gyp
@@ -221,6 +221,7 @@
         'internal/key_event_transformer_test.cc',
       ],
       'dependencies': [
+        '../base/absl.gyp:absl_base',
         '../base/base.gyp:base',
         '../converter/converter_base.gyp:converter_mock',
         '../engine/engine.gyp:mock_converter_engine',
--- /src/storage/storage_test.gyp
+++ /src/storage/storage_test.gyp
@@ -41,6 +41,7 @@
         'tiny_storage_test.cc',
       ],
       'dependencies': [
+        '../base/absl.gyp:absl_base',
         '../testing/testing.gyp:gtest_main',
         'storage.gyp:storage',
       ],