diff --git a/src/osgEarthDrivers/CMakeLists.txt b/src/osgEarthDrivers/CMakeLists.txt
index d178f951b..010896310 100644
--- a/src/osgEarthDrivers/CMakeLists.txt
+++ b/src/osgEarthDrivers/CMakeLists.txt
@@ -30,7 +30,6 @@ add_subdirectory(earth)
 add_subdirectory(engine_rex)
 add_subdirectory(featurefilter_intersect)
 add_subdirectory(featurefilter_join)
-add_subdirectory(gltf)
 add_subdirectory(kml)
 add_subdirectory(mapinspector)
 add_subdirectory(monitor)
@@ -40,7 +39,6 @@ add_subdirectory(sky_simple)
 add_subdirectory(template)
 add_subdirectory(terrainshader)
 add_subdirectory(webp)
-add_subdirectory(lerc)
 add_subdirectory(vdatum_egm2008)
 add_subdirectory(vdatum_egm84)
 add_subdirectory(vdatum_egm96)