diff --git a/.gitignore b/.gitignore
index 8f4cf62..c1bf33e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,9 @@
 # ignore intermediate and build objects
 *.fasl
 *.pyc
-*.o
\ No newline at end of file
+*.o
+
+# ignore build systems
+.ninja_deps
+.ninja_log
+*.ninja