--- a/third_party/angle/angle_common_gn/moz.build       Thu Jul 16 17:00:00 2026 -0700
+++ b/third_party/angle/angle_common_gn/moz.build       Thu Jul 16 17:00:00 2026 -0700
@@ -144,6 +144,13 @@
     DEFINES["__STDC_CONSTANT_MACROS"] = True
     DEFINES["__STDC_FORMAT_MACROS"] = True

+if CONFIG["OS_TARGET"] == "SunOS":
+
+    UNIFIED_SOURCES += [
+        "/third_party/angle/src/common/system_utils_linux.cpp",
+        "/third_party/angle/src/common/system_utils_posix.cpp"
+    ]
+
 if CONFIG["OS_TARGET"] == "WINNT":

     DEFINES["ANGLE_IS_WIN"] = True
diff -r 000000000000 -r 000000000000 third_party/angle/angle_program_version_id_gn/moz.build
--- a/third_party/angle/angle_program_version_id_gn/moz.build   Thu Jul 16 17:00:00 2026 -0700
+++ b/third_party/angle/angle_program_version_id_gn/moz.build   Thu Jul 16 17:00:00 2026 -0700
@@ -69,6 +69,15 @@
         script="/python/mozbuild/mozbuild/action/write_path_list.py",
     )

+if CONFIG["OS_TARGET"] == "SunOS":
+
+    GeneratedFile(
+        "/third_party/angle/gen/ANGLEShaderProgramVersion.h.rsp",
+        entry_point="write_paths",
+        inputs=['ANGLEShaderProgramVersion.h-f55f152d23101920.rsp.in'],
+        script="/python/mozbuild/mozbuild/action/write_path_list.py",
+    )
+
 if CONFIG["OS_TARGET"] == "WINNT":

     DEFINES["UNICODE"] = True