--- a/doc/hgrc.5.txt
+++ b/doc/hgrc.5.txt
@@ -215,6 +215,15 @@ extensions::
     # (this extension will get loaded from the file specified)
     myfeature = ~/.hgext/myfeature.py
 
+format::
+
+  usestore;;
+    Enable or disable the "store" repository format which improves
+    compatibility with systems that fold case or otherwise mangle
+    filenames. Enabled by default. Disabling this option will allow
+    you to store longer filenames in some situations at the expense of
+    compatibility.
+
 hooks::
   Commands or Python functions that get automatically executed by
   various actions such as starting or finishing a commit. Multiple

--- a/mercurial/localrepo.py
+++ b/mercurial/localrepo.py
@@ -41,8 +41,11 @@ class localrepository(repo.repository):
                 if not os.path.exists(path):
                     os.mkdir(path)
                 os.mkdir(self.path)
-                os.mkdir(os.path.join(self.path, "store"))
-                requirements = ("revlogv1", "store")
+                if parentui.config('format', 'usestore', 1):
+                    os.mkdir(os.path.join(self.path, "store"))
+                    requirements = ("revlogv1", "store")
+                else:
+                    requirements = ("revlogv1")
                 reqfile = self.opener("requires", "w")
                 for r in requirements:
                     reqfile.write("%s\n" % r)