diff --git a/3rdparty/o2/.gitignore b/3rdparty/o2/.gitignore
new file mode 100644
index 0000000000000000000000000000000000000000..f66405961873c15457949df59f1303185851830a
--- /dev/null
+++ b/3rdparty/o2/.gitignore
@@ -0,0 +1,2 @@
+*CMakeLists.txt.user
+_build/