diff --git a/libcxx/.gitignore b/libcxx/.gitignore
--- a/libcxx/.gitignore
+++ b/libcxx/.gitignore
@@ -27,6 +27,9 @@
 #  before PyInstaller builds the exe, so as to inject date/other infos into it.
 *.manifest
 *.spec
+# Don't ignore a directory ending in .spec, since we have several of those in
+# the tests.
+!*.spec/
 
 # Installer logs
 pip-log.txt