From f51a50478c0de482564f78cc7c2f1eb697c20c7e Mon Sep 17 00:00:00 2001
From: Kyle Sunden <git@ksunden.space>
Date: Mon, 5 Dec 2022 13:26:00 -0600
Subject: [PATCH] Backport PR #24592: DOC: Don't try to link paths that are on
 a different drive

---
 doc/conf.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/doc/conf.py b/doc/conf.py
index 55cabd84d1c7..9a46f513dea1 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -662,7 +662,10 @@ def linkcode_resolve(domain, info):
                     if lineno else "")
 
         startdir = Path(matplotlib.__file__).parent.parent
-        fn = os.path.relpath(fn, start=startdir).replace(os.path.sep, '/')
+        try:
+            fn = os.path.relpath(fn, start=startdir).replace(os.path.sep, '/')
+        except ValueError:
+            return None
 
         if not fn.startswith(('matplotlib/', 'mpl_toolkits/')):
             return None