diff --git a/math/gemmlowp/.gitignore b/math/gemmlowp/.gitignore
new file mode 100644
index 000000000..72be90b84
--- /dev/null
+++ b/math/gemmlowp/.gitignore
@@ -0,0 +1 @@
+/gemmlowp
diff --git a/math/kissfft/.gitignore b/math/kissfft/.gitignore
new file mode 100644
index 000000000..2f47d6a3a
--- /dev/null
+++ b/math/kissfft/.gitignore
@@ -0,0 +1 @@
+/kissfft
diff --git a/math/ruy/.gitignore b/math/ruy/.gitignore
new file mode 100644
index 000000000..8566c611d
--- /dev/null
+++ b/math/ruy/.gitignore
@@ -0,0 +1 @@
+/ruy
diff --git a/system/flatbuffers/.gitignore b/system/flatbuffers/.gitignore
new file mode 100644
index 000000000..266005cbb
--- /dev/null
+++ b/system/flatbuffers/.gitignore
@@ -0,0 +1 @@
+/flatbuffers
diff --git a/videoutils/openh264/.gitignore b/videoutils/openh264/.gitignore
new file mode 100644
index 000000000..dec5af346
--- /dev/null
+++ b/videoutils/openh264/.gitignore
@@ -0,0 +1 @@
+openh264