--- build/linux/unbundle/icu.gn.orig	2023-04-13 18:16:16 UTC
+++ build/linux/unbundle/icu.gn
@@ -17,6 +17,15 @@ config("icu_config") {
     "USING_SYSTEM_ICU=1",
     "ICU_UTIL_DATA_IMPL=ICU_UTIL_DATA_STATIC",
 
+    # As of icu 73 C++ nullptr, char16_t, override, final and noexcept are used
+    # instead of defines. These definitions can be removed when the bundled icu
+    # gets updated to 73. For more details, see:
+    # https://unicode-org.atlassian.net/browse/ICU-21833 and
+    # https://github.com/unicode-org/icu/commit/28643799377ecf654564f6f31854b02788cebe33
+    "U_FINAL=final",
+    "U_NOEXCEPT=noexcept",
+    "U_OVERRIDE=override",
+
     # U_EXPORT (defined in unicode/platform.h) is used to set public visibility
     # on classes through the U_COMMON_API and U_I18N_API macros (among others).
     # When linking against the system ICU library, we want its symbols to have