confirm working on ubuntu
diff --git a/.Rproj.user/441ADA46/build_options b/.Rproj.user/441ADA46/build_options
new file mode 100644
index 0000000..7e9daa4
--- /dev/null
+++ b/.Rproj.user/441ADA46/build_options
@@ -0,0 +1,7 @@
+auto_roxygenize_for_build_and_reload="0"
+auto_roxygenize_for_build_package="1"
+auto_roxygenize_for_check="1"
+live_preview_website="1"
+makefile_args=""
+preview_website="1"
+website_output_format="all"