diff --git a/3rdparty/CMakeLists.txt b/3rdparty/CMakeLists.txt
new file mode 100644
index 0000000000000000000000000000000000000000..40cefc55aafc9be07149e486841f61fe7a71cfe0
--- /dev/null
+++ b/3rdparty/CMakeLists.txt
@@ -0,0 +1 @@
+ADD_SUBDIRECTORY(o2)