--- ./doc/Makefile.in.orig	2012-11-25 13:35:12.000000000 +0100
+++ ./doc/Makefile.in	2016-04-14 22:40:30.225381000 +0200
@@ -209,7 +209,7 @@
 LN_S = @LN_S@
 LTLIBOBJS = @LTLIBOBJS@
 MAINT = @MAINT@
-MAKEINFO = @MAKEINFO@
+MAKEINFO = @MAKEINFO@ --force 
 MANIFEST_TOOL = @MANIFEST_TOOL@
 MKDIR_P = @MKDIR_P@
 MPICC = @MPICC@