--- CMakeLists.custom.txt.old	2016-02-21 00:27:31.328461633 -0500
+++ CMakeLists.custom.txt	2016-02-21 00:28:19.798459722 -0500
@@ -1,3 +1,9 @@
 # You can add custom plugins here to avoid touching plugins/CMakeLists.txt,
 # This can be useful if you've made modifications to that file and try to
 # switch between branches that have also made modifications to it.
+
+OPTION(BUILD_TWBT "Build df-twbt." ON)
+if(BUILD_TWBT)
+    add_subdirectory (df-twbt)
+endif()
+