diff -r d4a2e0d5d042 -r a8a902d7176e mercurial/sslutil.py
--- a/mercurial/sslutil.py	Sat Mar 24 15:09:33 2018 +0900
+++ b/mercurial/sslutil.py	Sat Mar 24 15:10:51 2018 +0900
@@ -22,6 +22,7 @@
     util,
 )
 from .utils import (
+    procutil,
     stringutil,
 )
 
@@ -686,7 +687,7 @@
       for using system certificate store CAs in addition to the provided
       cacerts file
     """
-    if (not pycompat.isdarwin or util.mainfrozen() or
+    if (not pycompat.isdarwin or procutil.mainfrozen() or
         not pycompat.sysexecutable):
         return False
     exe = os.path.realpath(pycompat.sysexecutable).lower()