diff --git a/.gitignore b/.gitignore
index 6a2ef53b1..5955142ad 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,7 @@
 *~
 *.cmi
 *.cmx
+*.cmo
 *.o
+.merlin
 
diff --git a/bench/.gitignore b/bench/.gitignore
new file mode 100644
index 000000000..6265c420a
--- /dev/null
+++ b/bench/.gitignore
@@ -0,0 +1,4 @@
+/bench.exe
+/Pprint_gt.ml
+/Pprint_default.ml
+
diff --git a/runtime/.gitignore b/runtime/.gitignore
new file mode 100644
index 000000000..ede012c6b
--- /dev/null
+++ b/runtime/.gitignore
@@ -0,0 +1,2 @@
+*.a
+
diff --git a/src/.gitignore b/src/.gitignore
new file mode 100644
index 000000000..af3dc85cf
--- /dev/null
+++ b/src/.gitignore
@@ -0,0 +1,4 @@
+.depend
+lamac
+lamac.byte
+
diff --git a/stdlib/.gitignore b/stdlib/.gitignore
new file mode 100644
index 000000000..48382914d
--- /dev/null
+++ b/stdlib/.gitignore
@@ -0,0 +1,3 @@
+*.i
+*.s
+