From 03929d59598e583ac4e06e5cc18bd27cbce2b7e6 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Fri, 6 Sep 2019 10:52:22 +0530
Subject: [PATCH] Fix building of calibre portable installer

---
 bypy/windows/__main__.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/bypy/windows/__main__.py b/bypy/windows/__main__.py
index 7eee5facb5..6f1d66b68e 100644
--- a/bypy/windows/__main__.py
+++ b/bypy/windows/__main__.py
@@ -366,7 +366,7 @@ def install_site_py(env):
 
 
 def build_portable_installer(env):
-    zf = a(j(env.dist, 'calibre-portable-%s.zip.lz' % VERSION))
+    zf = a(j(env.dist, 'calibre-portable-%s.zip.lz' % VERSION)).replace(os.sep, '/')
     usz = env.portable_uncompressed_size or os.path.getsize(zf)
 
     def cc(src, obj):