$OpenBSD: patch-doc_Makefile_in,v 1.1 2017/04/17 14:45:58 ajacoutot Exp $

XXX fix + push upstream
Drop option specific to GNU cp(1).

--- doc/Makefile.in.orig	Mon Apr 17 16:07:51 2017
+++ doc/Makefile.in	Mon Apr 17 16:07:59 2017
@@ -881,7 +881,7 @@ dist-hook:
 install-data-hook:
 	if test -d "$(srcdir)/html"; then                            \
 		$(MKDIR_P) "$(DESTDIR)$(docdir)/html" ;              \
-		cp -R --no-preserve=all $(srcdir)/html/* "$(DESTDIR)$(docdir)/html/" ; \
+		cp -R $(srcdir)/html/* "$(DESTDIR)$(docdir)/html/" ; \
 	fi
 
 uninstall-local:
