diff --git a/.gitignore b/.gitignore
index e69de29..0603da8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -0,0 +1,2 @@
+build/*.o
+build/ptf
diff --git a/build/.gitkeep b/build/.gitkeep
new file mode 100644
index 0000000..e69de29