diff --git a/.gitignore b/.gitignore
index f7bcbd145986d..a09c95d8fa60d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,8 @@
+# Build subdirectories.
+/*build*
+!/build-aux
+!/build_msvc
+
 *.tar.gz
 
 *.exe