diff -upr chromium-71.0.3578.80.orig/third_party/widevine/cdm/widevine_cdm_version.h chromium-71.0.3578.80/third_party/widevine/cdm/widevine_cdm_version.h
--- chromium-71.0.3578.80.orig/third_party/widevine/cdm/widevine_cdm_version.h	2018-12-21 20:18:01.000000000 +0000
+++ chromium-71.0.3578.80/third_party/widevine/cdm/widevine_cdm_version.h	2018-12-21 21:37:45.635374949 +0000
@@ -12,4 +12,6 @@
 //  - WIDEVINE_CDM_VERSION_STRING (with the version of the CDM that's available
 //    as a string, e.g., "1.0.123.456").
 
+#define WIDEVINE_CDM_VERSION_STRING "unknown"
+
 #endif  // WIDEVINE_CDM_VERSION_H_