diff --git a/Utilities/Dox/CMakeLists.txt b/Utilities/Dox/CMakeLists.txt
index ed7763cac..aaa12312e 100644
--- a/Utilities/Dox/CMakeLists.txt
+++ b/Utilities/Dox/CMakeLists.txt
@@ -22,9 +22,10 @@ find_package(Java REQUIRED)
 include(UseJava)
 
 find_program(DOT_EXECUTABLE NAMES dot REQUIRED)
-
-set(DOCUMENT_VISTA_DOX_OUTPUT_DIR "${DOCUMENT_VISTA_OUTPUT_DIR}/dox")
-set(DOCUMENT_VISTA_FILES_OUTPUT_DIR "${DOCUMENT_VISTA_OUTPUT_DIR}/vivian-data")
+set(DOCUMENT_VISTA_DIR_PREFIX "" CACHE STRING "String to append to each output directory")
+mark_as_advanced(DOCUMENT_VISTA_DIR_PREFIX)
+set(DOCUMENT_VISTA_DOX_OUTPUT_DIR "${DOCUMENT_VISTA_OUTPUT_DIR}/${DOCUMENT_VISTA_DIR_PREFIX}dox")
+set(DOCUMENT_VISTA_FILES_OUTPUT_DIR "${DOCUMENT_VISTA_OUTPUT_DIR}/${DOCUMENT_VISTA_DIR_PREFIX}vivian-data")
 set(DOCUMENT_VISTA_PDF_OUTPUT_DIR "${DOCUMENT_VISTA_DOX_OUTPUT_DIR}/PDF")
 
 set(DOCUMENT_VISTA_M_DIR "" CACHE PATH