diff --git a/Modules/FindPackageHandleStandardArgs.cmake b/Modules/FindPackageHandleStandardArgs.cmake
index 091954f0e..47cf017ae 100644
--- a/Modules/FindPackageHandleStandardArgs.cmake
+++ b/Modules/FindPackageHandleStandardArgs.cmake
@@ -28,10 +28,14 @@ FUNCTION(FIND_PACKAGE_HANDLE_STANDARD_ARGS _NAME _FAIL_MSG _VAR1 )
 
   STRING(TOUPPER ${_NAME} _NAME_UPPER)
 
+  # collect all variables which were not found, so they can be printed, so the 
+  # user knows better what went wrong (#6375)
+  SET(MISSING_VARS "")
   SET(DETAILS "")
   SET(${_NAME_UPPER}_FOUND TRUE)
   IF(NOT ${_VAR1})
     SET(${_NAME_UPPER}_FOUND FALSE)
+    SET(MISSING_VARS " ${_VAR1}")
   ELSE(NOT ${_VAR1})
     SET(DETAILS "${DETAILS}[${${_VAR1}}]")
   ENDIF(NOT ${_VAR1})
@@ -40,6 +44,7 @@ FUNCTION(FIND_PACKAGE_HANDLE_STANDARD_ARGS _NAME _FAIL_MSG _VAR1 )
   FOREACH(_CURRENT_VAR ${ARGN})
     IF(NOT ${_CURRENT_VAR})
       SET(${_NAME_UPPER}_FOUND FALSE)
+      SET(MISSING_VARS "${MISSING_VARS} ${_CURRENT_VAR}")
     ELSE(NOT ${_CURRENT_VAR})
       SET(DETAILS "${DETAILS}[${${_CURRENT_VAR}}]")
     ENDIF(NOT ${_CURRENT_VAR})
@@ -49,10 +54,10 @@ FUNCTION(FIND_PACKAGE_HANDLE_STANDARD_ARGS _NAME _FAIL_MSG _VAR1 )
     FIND_PACKAGE_MESSAGE(${_NAME} "Found ${_NAME}: ${${_VAR1}}" "${DETAILS}")
   ELSE (${_NAME_UPPER}_FOUND)
     IF (${_NAME}_FIND_REQUIRED)
-        MESSAGE(FATAL_ERROR "${_FAIL_MESSAGE}")
+        MESSAGE(FATAL_ERROR "${_FAIL_MESSAGE} (missing: ${MISSING_VARS})")
     ELSE (${_NAME}_FIND_REQUIRED)
       IF (NOT ${_NAME}_FIND_QUIETLY)
-        MESSAGE(STATUS "${_FAIL_MESSAGE}")
+        MESSAGE(STATUS "${_FAIL_MESSAGE}  (missing: ${MISSING_VARS})")
       ENDIF (NOT ${_NAME}_FIND_QUIETLY)
     ENDIF (${_NAME}_FIND_REQUIRED)
   ENDIF (${_NAME_UPPER}_FOUND)