diff --git a/cobalt/BUILD.gn b/cobalt/BUILD.gn
index 4819e94b33758..b800883369937 100644
--- a/cobalt/BUILD.gn
+++ b/cobalt/BUILD.gn
@@ -16,7 +16,10 @@ group("gn_all") {
   testonly = true
 
   # TODO(b/371589344): Fix android build configs.
-  deps = [ "//starboard($starboard_toolchain)" ]
+  deps = [
+    "//starboard($starboard_toolchain)",
+    "//starboard/nplb",
+  ]
   if (!is_android) {
     deps += [ ":cobalt" ]
   } else {
diff --git a/cobalt/docker/linux/Dockerfile b/cobalt/docker/linux/Dockerfile
index e69bfa7f34b2e..9534beb6eafbc 100644
--- a/cobalt/docker/linux/Dockerfile
+++ b/cobalt/docker/linux/Dockerfile
@@ -25,6 +25,7 @@ RUN apt-get update && apt-get install -y \
     libpango-1.0-0 \
     gcc-multilib \
     bzip2 \
+    python3-certifi \
     && rm -rf /var/lib/apt/lists/*
 
 ADD files/sccache /usr/local/bin
diff --git a/starboard/BUILD.gn b/starboard/BUILD.gn
index eed1457bd1da2..e00e717c5d5e7 100644
--- a/starboard/BUILD.gn
+++ b/starboard/BUILD.gn
@@ -16,7 +16,7 @@ import("//starboard/build/config/os_definitions.gni")
 import("//starboard/build/config/starboard_target_type.gni")
 import("//starboard/contrib/cast/cast.gni")
 
-if (sb_is_modular) {
+if (!is_cobalt) {
   group("gn_all") {
     testonly = true
 
@@ -225,6 +225,8 @@ source_set("starboard_headers_only") {
 # TODO: b/374302273 - Fix starboard implementation to not emit these compiler warnings.
 config("hacky_wnos") {
   cflags = [
+    "-Wno-undefined-internal",
+
     # Disable errors for the warning till the Android NDK r19 is fixed.
     # The warning is trigger when compiling .c files and complains for
     # "-stdlib=libc++" which is added by the NDK.
diff --git a/starboard/android/shared/BUILD.gn b/starboard/android/shared/BUILD.gn
index 10b1859261e84..b6836075e1a11 100644
--- a/starboard/android/shared/BUILD.gn
+++ b/starboard/android/shared/BUILD.gn
@@ -213,7 +213,6 @@ static_library("starboard_platform") {
     "log_internal.cc",
     "log_internal.h",
     "log_raw.cc",
-    "main.cc",
     "max_media_codec_output_buffers_lookup_table.cc",
     "max_media_codec_output_buffers_lookup_table.h",
     "media_capabilities_cache.cc",
diff --git a/starboard/android/shared/platform_configuration/BUILD.gn b/starboard/android/shared/platform_configuration/BUILD.gn
index 54040f7419d84..8c348c4432795 100644
--- a/starboard/android/shared/platform_configuration/BUILD.gn
+++ b/starboard/android/shared/platform_configuration/BUILD.gn
@@ -23,6 +23,13 @@ config("platform_configuration") {
     "log",
     "mediandk",
   ]
+  cflags = [
+    "-fsigned-char",
+
+    # Ignore warnings in Chromium code related to forcing signed char.
+    "-Wno-sign-compare",
+    "-Wno-c++11-narrowing",
+  ]
 }
 
 config("size") {
diff --git a/starboard/common/BUILD.gn b/starboard/common/BUILD.gn
index eb6928b34aee0..609ba6375ae71 100644
--- a/starboard/common/BUILD.gn
+++ b/starboard/common/BUILD.gn
@@ -103,6 +103,7 @@ static_library("file_wrapper") {
     "file_wrapper.cc",
     "file_wrapper.h",
   ]
+  deps = [ "//starboard:starboard_headers_only" ]
 }
 
 target(gtest_target_type, "common_test") {
diff --git a/starboard/common/test_main.cc b/starboard/common/test_main.cc
index 375ff3a846b8e..94da2f171f557 100644
--- a/starboard/common/test_main.cc
+++ b/starboard/common/test_main.cc
@@ -12,10 +12,13 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+#include "starboard/configuration.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+#if SB_IS(EVERGREEN)
 #include "starboard/client_porting/wrap_main/wrap_main.h"
 #include "starboard/event.h"
 #include "starboard/system.h"
-#include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
 int InitAndRunAllTests(int argc, char** argv) {
@@ -26,7 +29,10 @@ int InitAndRunAllTests(int argc, char** argv) {
 
 // When we are building Evergreen we need to export SbEventHandle so that the
 // ELF loader can find and invoke it.
-#if SB_IS(MODULAR)
-SB_EXPORT
-#endif  // SB_IS(MODULAR)
-STARBOARD_WRAP_SIMPLE_MAIN(InitAndRunAllTests);
+SB_EXPORT STARBOARD_WRAP_SIMPLE_MAIN(InitAndRunAllTests);
+#else
+int main(int argc, char** argv) {
+  ::testing::InitGoogleTest(&argc, argv);
+  return RUN_ALL_TESTS();
+}
+#endif
diff --git a/starboard/linux/shared/BUILD.gn b/starboard/linux/shared/BUILD.gn
index e7db7e0d4cbb6..526914314dce3 100644
--- a/starboard/linux/shared/BUILD.gn
+++ b/starboard/linux/shared/BUILD.gn
@@ -228,6 +228,7 @@ static_library("starboard_platform_sources") {
     "//starboard/shared/starboard/file_storage/storage_read_record.cc",
     "//starboard/shared/starboard/log_mutex.cc",
     "//starboard/shared/starboard/log_mutex.h",
+    "//starboard/shared/starboard/log_raw_dump_stack.cc",
     "//starboard/shared/starboard/log_raw_format.cc",
     "//starboard/shared/starboard/media/media_can_play_mime_and_key_system.cc",
     "//starboard/shared/starboard/media/media_get_audio_buffer_budget.cc",
@@ -269,9 +270,6 @@ static_library("starboard_platform_sources") {
     "//starboard/shared/stub/thread_create_priority.cc",
     "//starboard/shared/stub/window_get_diagonal_size_in_inches.cc",
   ]
-  if (enable_evergreen_code) {
-    sources += [ "//starboard/shared/starboard/log_raw_dump_stack.cc" ]
-  }
 
   sources += common_player_sources
 
diff --git a/starboard/nplb/BUILD.gn b/starboard/nplb/BUILD.gn
index 73d9a13ce1acd..d1e1d97f07c4c 100644
--- a/starboard/nplb/BUILD.gn
+++ b/starboard/nplb/BUILD.gn
@@ -13,6 +13,7 @@
 # limitations under the License.
 
 import("//starboard/build/config/os_definitions.gni")
+import("//testing/test.gni")
 
 declare_args() {
   sb_enable_cast_codec_tests = false
@@ -22,7 +23,18 @@ config("cast_codec_tests") {
   cflags = [ "ENABLE_CAST_CODEC_TESTS" ]
 }
 
-target(gtest_target_type, "nplb") {
+config("wnos") {
+  cflags = [
+    "-Wno-ignored-qualifiers",
+    "-Wno-self-assign-overloaded",
+    "-Wno-pessimizing-move",
+    "-Wno-unused-local-typedef",
+    "-Wno-unreachable-code",
+    "-Wno-unreachable-code-break",
+  ]
+}
+
+test("nplb") {
   testonly = true
 
   sources = [
@@ -35,11 +47,7 @@ target(gtest_target_type, "nplb") {
     "//starboard/nplb/sabi/struct_alignment_test.cc",
     "//starboard/shared/starboard/drm/drm_test_helpers.cc",
     "//starboard/shared/starboard/drm/drm_test_helpers.h",
-    "//starboard/testing/fake_graphics_context_provider.cc",
-    "//starboard/testing/fake_graphics_context_provider.h",
     "align_test.cc",
-    "atomic_base_test.cc",
-    "atomic_test.cc",
     "audio_sink_create_test.cc",
     "audio_sink_destroy_test.cc",
     "audio_sink_get_max_channels_test.cc",
@@ -79,11 +87,9 @@ target(gtest_target_type, "nplb") {
     "drm_create_system_test.cc",
     "maximum_player_configuration_explorer.cc",
     "maximum_player_configuration_explorer.h",
-    "maximum_player_configuration_explorer_test.cc",
     "media_buffer_test.cc",
     "media_can_play_mime_and_key_system_test.cc",
     "media_configuration_test.cc",
-    "media_set_audio_write_duration_test.cc",
     "microphone_close_test.cc",
     "microphone_create_test.cc",
     "microphone_destroy_test.cc",
@@ -91,20 +97,13 @@ target(gtest_target_type, "nplb") {
     "microphone_is_sample_rate_supported_test.cc",
     "microphone_open_test.cc",
     "microphone_read_test.cc",
-    "multiple_player_test.cc",
     "murmurhash2_test.cc",
     "optional_test.cc",
-    "player_create_test.cc",
     "player_creation_param_helpers.cc",
     "player_creation_param_helpers.h",
-    "player_get_audio_configuration_test.cc",
-    "player_get_media_time_test.cc",
     "player_get_preferred_output_mode_test.cc",
-    "player_test_fixture.cc",
-    "player_test_fixture.h",
     "player_test_util.cc",
     "player_test_util.h",
-    "player_write_sample_test.cc",
     "posix_compliance/posix_arpa_inet_test.cc",
     "posix_compliance/posix_condition_variable_broadcast_test.cc",
     "posix_compliance/posix_condition_variable_create_test.cc",
@@ -185,7 +184,6 @@ target(gtest_target_type, "nplb") {
     "socket_waiter_destroy_test.cc",
     "socket_waiter_wake_up_test.cc",
     "socket_wrapper_test.cc",
-    "speech_synthesis_basic_test.cc",
     "storage_close_record_test.cc",
     "storage_get_record_size_test.cc",
     "storage_read_record_test.cc",
@@ -220,15 +218,35 @@ target(gtest_target_type, "nplb") {
     "ui_navigation_test.cc",
     "undefined_behavior_test.cc",
     "url_player_create_test.cc",
-    "vertical_video_test.cc",
-    "window_create_test.cc",
-    "window_destroy_test.cc",
-    "window_get_diagonal_size_in_inches_test.cc",
-    "window_get_platform_handle_test.cc",
-    "window_get_size_test.cc",
   ]
 
-  configs += [ "//starboard/build/config:starboard_implementation" ]
+  if (!is_android) {
+    sources += [
+      "//starboard/testing/fake_graphics_context_provider.cc",
+      "//starboard/testing/fake_graphics_context_provider.h",
+      "maximum_player_configuration_explorer_test.cc",
+      "media_set_audio_write_duration_test.cc",
+      "multiple_player_test.cc",
+      "player_create_test.cc",
+      "player_get_audio_configuration_test.cc",
+      "player_get_media_time_test.cc",
+      "player_test_fixture.cc",
+      "player_test_fixture.h",
+      "player_write_sample_test.cc",
+      "speech_synthesis_basic_test.cc",
+      "vertical_video_test.cc",
+      "window_create_test.cc",
+      "window_destroy_test.cc",
+      "window_get_diagonal_size_in_inches_test.cc",
+      "window_get_platform_handle_test.cc",
+      "window_get_size_test.cc",
+    ]
+  }
+
+  configs += [
+    "//starboard/build/config:starboard_implementation",
+    ":wnos",
+  ]
   if (sb_enable_cast_codec_tests) {
     configs += [ ":cast_codec_tests" ]
   }
@@ -264,7 +282,7 @@ target(gtest_target_type, "nplb") {
     "//starboard/shared/starboard/player:player_download_test_data",
   ]
 
-  if (is_clang && !is_android) {
+  if (is_clang) {
     # signedness_and_size_of_enum_test.cc casts -1 to enum value
     cflags = [ "-Wno-enum-constexpr-conversion" ]
   }
diff --git a/starboard/nplb/compiler_compliance/BUILD.gn b/starboard/nplb/compiler_compliance/BUILD.gn
index 38dcd9fea97aa..f790af98dbc09 100644
--- a/starboard/nplb/compiler_compliance/BUILD.gn
+++ b/starboard/nplb/compiler_compliance/BUILD.gn
@@ -12,11 +12,25 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+config("no_unused") {
+  cflags = [
+    "-Wno-unused-variable",
+    "-Wno-unused-function",
+    "-Wno-unused-const-variable",
+    "-Wno-unreachable-code-break",
+  ]
+}
+
 static_library("cpp14_supported") {
   sources = [
     "cpp14_constexpr.cc",
     "cpp14_initialization.cc",
   ]
+  configs += [
+    ":no_unused",
+    "//starboard/build/config:starboard",
+    "//starboard/build/config/sabi",
+  ]
   cflags_cc = [ "-std=c++14" ]
   deps = [ "//starboard:starboard_group" ]
 }
@@ -24,6 +38,11 @@ static_library("cpp14_supported") {
 if (sb_enable_cpp17_audit) {
   static_library("cpp17_supported") {
     sources = [ "cpp17_support.cc" ]
+    configs += [
+      "//starboard/build/config:starboard",
+      "//starboard/build/config/sabi",
+      ":no_unused",
+    ]
     deps = [
       ":cpp17_supported_config_shim",
       "//starboard:starboard_group",
@@ -44,11 +63,11 @@ if (sb_enable_cpp17_audit) {
 if (sb_enable_cpp20_audit) {
   static_library("cpp20_supported") {
     sources = [ "cpp20_support.cc" ]
+    configs += [ ":no_unused" ]
     deps = [
       ":cpp20_supported_config_shim",
       "//starboard:starboard_group",
     ]
-    configs -= [ "//starboard/build/config:default_cpp_standard" ]
   }
 
   # We do this to ensure the -std=c++20 flag is added after any other -std flag
diff --git a/starboard/nplb/maximum_player_configuration_explorer_test.cc b/starboard/nplb/maximum_player_configuration_explorer_test.cc
index ed704c3f05911..2318b6346ae38 100644
--- a/starboard/nplb/maximum_player_configuration_explorer_test.cc
+++ b/starboard/nplb/maximum_player_configuration_explorer_test.cc
@@ -16,6 +16,7 @@
 #include <string>
 #include <vector>
 
+#include "starboard/common/string.h"
 #include "starboard/nplb/drm_helpers.h"
 #include "starboard/nplb/maximum_player_configuration_explorer.h"
 #include "starboard/nplb/player_test_util.h"
diff --git a/starboard/nplb/posix_compliance/posix_directory_create_test.cc b/starboard/nplb/posix_compliance/posix_directory_create_test.cc
index db8cb81c42ca9..37fca7661e309 100644
--- a/starboard/nplb/posix_compliance/posix_directory_create_test.cc
+++ b/starboard/nplb/posix_compliance/posix_directory_create_test.cc
@@ -14,6 +14,7 @@
 
 #include <string>
 
+#include "starboard/common/string.h"
 #include "starboard/configuration_constants.h"
 #include "starboard/nplb/file_helpers.h"
 #include "starboard/system.h"
diff --git a/starboard/nplb/posix_compliance/posix_directory_get_next_test.cc b/starboard/nplb/posix_compliance/posix_directory_get_next_test.cc
index 749b9aedf3518..ba6649051d501 100644
--- a/starboard/nplb/posix_compliance/posix_directory_get_next_test.cc
+++ b/starboard/nplb/posix_compliance/posix_directory_get_next_test.cc
@@ -19,6 +19,7 @@
 #include <string>
 
 #include "starboard/common/log.h"
+#include "starboard/common/string.h"
 #include "starboard/configuration.h"
 #include "starboard/configuration_constants.h"
 #include "starboard/nplb/file_helpers.h"
diff --git a/starboard/nplb/posix_compliance/posix_socket_bind_test.cc b/starboard/nplb/posix_compliance/posix_socket_bind_test.cc
index e9aa8853632c1..ae86196ac7b7a 100644
--- a/starboard/nplb/posix_compliance/posix_socket_bind_test.cc
+++ b/starboard/nplb/posix_compliance/posix_socket_bind_test.cc
@@ -15,6 +15,7 @@
 // Here we are not trying to do anything fancy, just to really sanity check that
 // this is hooked up to something.
 
+#include "starboard/common/string.h"
 #include "starboard/nplb/posix_compliance/posix_socket_helpers.h"
 
 namespace starboard {
diff --git a/starboard/nplb/posix_compliance/posix_socket_helpers.h b/starboard/nplb/posix_compliance/posix_socket_helpers.h
index 5b14126834add..e084c36a4e67e 100644
--- a/starboard/nplb/posix_compliance/posix_socket_helpers.h
+++ b/starboard/nplb/posix_compliance/posix_socket_helpers.h
@@ -23,6 +23,7 @@
 #include <sys/types.h>
 #include <unistd.h>
 
+#include "starboard/common/log.h"
 #include "starboard/common/time.h"
 #include "starboard/nplb/socket_helpers.h"
 #include "starboard/socket.h"
diff --git a/starboard/nplb/posix_compliance/posix_socket_send_test.cc b/starboard/nplb/posix_compliance/posix_socket_send_test.cc
index c2c158b5309f8..e3a492c6e1392 100644
--- a/starboard/nplb/posix_compliance/posix_socket_send_test.cc
+++ b/starboard/nplb/posix_compliance/posix_socket_send_test.cc
@@ -19,6 +19,7 @@
 #include <pthread.h>
 #include <string.h>
 #include <unistd.h>
+#include "starboard/common/log.h"
 #include "starboard/nplb/posix_compliance/posix_socket_helpers.h"
 #include "starboard/thread.h"
 
diff --git a/starboard/nplb/testdata/file_tests/BUILD.gn b/starboard/nplb/testdata/file_tests/BUILD.gn
index bb96507aedbb1..1566e4f321d11 100644
--- a/starboard/nplb/testdata/file_tests/BUILD.gn
+++ b/starboard/nplb/testdata/file_tests/BUILD.gn
@@ -13,8 +13,6 @@
 # limitations under the License.
 
 copy("nplb_file_tests_data") {
-  install_content = true
-
   sources = [
     "dir_with_files/file11",
     "dir_with_files/file12",
diff --git a/starboard/shared/ffmpeg/BUILD.gn b/starboard/shared/ffmpeg/BUILD.gn
index 95578ba6a8a7e..d4a3be1bcdfbb 100644
--- a/starboard/shared/ffmpeg/BUILD.gn
+++ b/starboard/shared/ffmpeg/BUILD.gn
@@ -119,5 +119,4 @@ target(gtest_target_type, "ffmpeg_demuxer_test") {
     "//testing/gmock",
     "//testing/gtest",
   ]
-  data_deps = [ "//media/test/data:media_testdata" ]
 }