We don't need this module

--- INSTALL.d/prerequisites_imapsync
+++ INSTALL.d/prerequisites_imapsync
@@ -3,7 +3,6 @@
 # $Id: prerequisites_imapsync,v 1.35 2019/11/27 15:58:46 gilles Exp gilles $
 
 MODULES_MANDATORY='
-App::cpanminus
 Authen::NTLM
 CGI
 Compress::Zlib