diff --git a/plugins/CMakeLists.txt b/plugins/CMakeLists.txt
index 8528c9028..7ff9ed6b5 100644
--- a/plugins/CMakeLists.txt
+++ b/plugins/CMakeLists.txt
@@ -15,6 +15,11 @@ if(BUILD_STONESENSE)
     add_subdirectory (stonesense)
 endif()
 
+OPTION(BUILD_ISOWORLD "Build isoworld (needs a checkout first)." OFF)
+if(BUILD_ISOWORLD)
+    add_subdirectory (isoworld)
+endif()
+
 OPTION(BUILD_DEV_PLUGINS "Build developer plugins." OFF)
 if(BUILD_DEV_PLUGINS)
     add_subdirectory (devel)
diff --git a/plugins/isoworld b/plugins/isoworld
new file mode 160000
index 000000000..d8d8a836b
--- /dev/null
+++ b/plugins/isoworld
@@ -0,0 +1 @@
+Subproject commit d8d8a836bb9fb0d27861a17aa1f772a4575acffd