Merge branch 'cherry-pick-8e930ab2-21.3' into '21.3'

Sweeping !20350 from master to 21.3.
FTK_RecTools: cmake fix

See merge request atlas/athena!20381

(cherry picked from commit 94a637b9)

356d9f4c Merge branch 'cmake.FTK_RecTools-20190114' into 'master'

Trigger/TrigFTK/FTK_RecTools/CMakeLists.txt

@@ -40,7 +40,9 @@ atlas_depends_on_subdirs( PUBLIC
 
 
 # External dependencies:
-find_package( ROOT COMPONENTS Core Tree MathCore Hist RIO pthread Eigen CLHEP )
+find_package( ROOT COMPONENTS Core Tree MathCore Hist RIO pthread )
+find_package( Eigen )
+find_package( CLHEP )
 
 # Component(s) in the package:
 atlas_add_library( FTK_RecToolsLib