diff --git a/rootdir/Android.mk b/rootdir/Android.mk
index f88f6b9..f1a38c7 100644
--- a/rootdir/Android.mk
+++ b/rootdir/Android.mk
@@ -130,6 +130,19 @@
 LOCAL_POST_INSTALL_CMD += ; ln -sf /vendor/odm/priv-app $(TARGET_ROOT_OUT)/odm/priv-app
 LOCAL_POST_INSTALL_CMD += ; ln -sf /vendor/odm/usr $(TARGET_ROOT_OUT)/odm/usr
 
+# Start of runtime APEX compatibility.
+# Keeping the appearance of files/dirs having old locations for apps that have
+# come to rely on them.
+
+# http://b/121248172 - create a link from /system/usr/icu to
+# /apex/com.android.runtime/etc/icu so that apps can find the ICU .dat file.
+# A symlink can't overwrite a directory and the /system/usr/icu directory once
+# existed so the required structure must be created whatever we find.
+LOCAL_POST_INSTALL_CMD += ; mkdir -p $(TARGET_OUT)/usr && rm -rf $(TARGET_OUT)/usr/icu
+LOCAL_POST_INSTALL_CMD += ; ln -sf /apex/com.android.runtime/etc/icu $(TARGET_OUT)/usr/icu
+
+# End of runtime APEX compatibilty.
+
 ifdef BOARD_CACHEIMAGE_FILE_SYSTEM_TYPE
   LOCAL_POST_INSTALL_CMD += ; mkdir -p $(TARGET_ROOT_OUT)/cache
 else