diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1e4c17dff..625c2ae6c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -97,10 +97,18 @@ cmake_dependent_option(XRT_FEATURE_SERVICE "Enable separate service module for O
 cmake_dependent_option(XRT_HAVE_SYSTEMD "Enable systemd support (for socket activation of service)" ON "Systemd_FOUND AND XRT_FEATURE_SERVICE" OFF)
 cmake_dependent_option(XRT_INSTALL_SYSTEMD_UNIT_FILES "Install user unit files for systemd socket activation on installation" ON "XRT_HAVE_SYSTEMD" OFF)
 cmake_dependent_option(XRT_INSTALL_ABSOLUTE_SYSTEMD_UNIT_FILES "Use an absolute path to monado-system in installed user unit files for systemd socket activation" ON "XRT_INSTALL_SYSTEMD_UNIT_FILES" OFF)
-set(XRT_FEATURE_OPENXR_LAYER_DEPTH ON)
-set(XRT_FEATURE_OPENXR_LAYER_CUBE OFF)
-set(XRT_FEATURE_OPENXR_LAYER_CYLINDER ON)
-set(XRT_FEATURE_OPENXR_LAYER_EQUIRECT OFF)
+if(NOT DEFINED XRT_FEATURE_OPENXR_LAYER_DEPTH)
+	set(XRT_FEATURE_OPENXR_LAYER_DEPTH ON)
+endif()
+if(NOT DEFINED XRT_FEATURE_OPENXR_LAYER_CUBE)
+	set(XRT_FEATURE_OPENXR_LAYER_CUBE OFF)
+endif()
+if(NOT DEFINED XRT_FEATURE_OPENXR_LAYER_CYLINDER)
+	set(XRT_FEATURE_OPENXR_LAYER_CYLINDER ON)
+endif()
+if(NOT DEFINED XRT_FEATURE_OPENXR_LAYER_EQUIRECT)
+	set(XRT_FEATURE_OPENXR_LAYER_EQUIRECT OFF)
+endif()
 
 # Most users won't touch these.
 mark_as_advanced(XRT_FEATURE_COMPOSITOR_MAIN XRT_FEATURE_OPENXR)