--- a/configure.in
+++ b/configure.in
@@ -6130,16 +6130,18 @@ AC_SUBST(MOZ_APP_DISPLAYNAME)
 AC_SUBST(MOZ_APP_VERSION)
 AC_SUBST(MOZ_APP_MAXVERSION)
 AC_SUBST(MAR_CHANNEL_ID)
 AC_SUBST(ACCEPTED_MAR_CHANNEL_IDS)
 AC_SUBST(FIREFOX_VERSION)
 AC_SUBST(THUNDERBIRD_VERSION)
 AC_SUBST(SUNBIRD_VERSION)
 AC_SUBST(SEAMONKEY_VERSION)
+AC_DEFINE_UNQUOTED(MOZ_UA_BUILDID, "$MOZ_UA_BUILDID")
+AC_SUBST(MOZ_UA_BUILDID)
 
 AC_SUBST(MOZ_PKG_SPECIAL)
 
 AC_SUBST(MAIL_PKG_SHARED)
 
 AC_SUBST(MOZILLA_OFFICIAL)
 
 dnl win32 options

--- a/suite/confvars.sh
+++ b/suite/confvars.sh
@@ -38,12 +38,14 @@ MOZ_SERVICES_CRYPTO=1
 MOZ_SERVICES_NOTIFICATIONS=1
 MOZ_SERVICES_SYNC=1
 MOZ_URL_CLASSIFIER=1
 
 MOZ_APP_VERSION_TXT=${_topsrcdir}/$MOZ_BUILD_APP/config/version.txt
 MOZ_APP_VERSION=`cat $MOZ_APP_VERSION_TXT`
 SEAMONKEY_VERSION=$MOZ_APP_VERSION
 
+MOZ_UA_BUILDID=20100101
+
 MOZ_APP_ID={92650c4d-4b8e-4d2a-b7eb-24ecf4f6b63a}
 MOZ_PROFILE_MIGRATOR=1
 MOZ_EXTENSION_MANAGER=1
 MOZ_APP_STATIC_INI=1