diff --git a/Trigger/TrigConfiguration/TrigConfIO/CMakeLists.txt b/Trigger/TrigConfiguration/TrigConfIO/CMakeLists.txt
index bc1512e56f0b314366dae8271a6b4a3f522a6a0d..d056220950aa208577f24509a8406ccff3980aa8 100644
--- a/Trigger/TrigConfiguration/TrigConfIO/CMakeLists.txt
+++ b/Trigger/TrigConfiguration/TrigConfIO/CMakeLists.txt
@@ -5,6 +5,8 @@ atlas_subdir( TrigConfIO )
 
 # External dependencies:
 find_package( Boost )
+find_package( Oracle )     # Oracle client libraries for DB access
+find_package( cx_Oracle )  # Oracle python client
 find_package( nlohmann_json )
 find_package( CORAL COMPONENTS CoralBase CoralKernel RelationalAccess )
 
diff --git a/Trigger/TrigConfiguration/TrigConfigSvc/CMakeLists.txt b/Trigger/TrigConfiguration/TrigConfigSvc/CMakeLists.txt
index 39beedaaf794d7c4bee76c18357ece7a24088883..403be78b6b13ec06d926dae174f3f20fa930beef 100644
--- a/Trigger/TrigConfiguration/TrigConfigSvc/CMakeLists.txt
+++ b/Trigger/TrigConfiguration/TrigConfigSvc/CMakeLists.txt
@@ -6,7 +6,8 @@ atlas_subdir( TrigConfigSvc )
 # External dependencies:
 find_package( Boost )
 find_package( COOL COMPONENTS CoolKernel )
-find_package( cx_Oracle )
+find_package( Oracle )     # Oracle client libraries for DB access
+find_package( cx_Oracle )  # Oracle python client
 find_package( nlohmann_json )
 
 atlas_add_component( TrigConfigSvc
diff --git a/Trigger/TrigT1/L1Topo/L1TopoConfig/CMakeLists.txt b/Trigger/TrigT1/L1Topo/L1TopoConfig/CMakeLists.txt
index e98f97b76bd3aaf5d1e930a87b7826de232289c9..098bafc9982363cba477461528472ebb928ef4bd 100644
--- a/Trigger/TrigT1/L1Topo/L1TopoConfig/CMakeLists.txt
+++ b/Trigger/TrigT1/L1Topo/L1TopoConfig/CMakeLists.txt
@@ -1,10 +1,12 @@
-# Copyright (C) 2002-2020 CERN for the benefit of the ATLAS collaboration
+# Copyright (C) 2002-2021 CERN for the benefit of the ATLAS collaboration
 
 # Declare the package name:
 atlas_subdir( L1TopoConfig )
 
 # External dependencies:
 find_package( Boost )
+find_package( Oracle )     # Oracle client libraries for DB access
+find_package( cx_Oracle )  # Oracle python client
 
 # Component(s) in the package:
 atlas_add_library( L1TopoConfig