subtree: fix build with AsciiDoctor 2

This is a (late) companion for f6461b82b93 (Documentation: fix build
with Asciidoctor 2, 2019-09-15).

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/contrib/subtree/Makefile b/contrib/subtree/Makefile
index 6906aae44147810ec2cf7560eb2cae3ef56bb454..6fa7496bfdb3fdbcf42a03e88cbcd773f6a302cc 100644 (file)
--- a/contrib/subtree/Makefile
+++ b/contrib/subtree/Makefile
@@ -25,14 +25,16 @@ ASCIIDOC_HTML    = xhtml11
 ASCIIDOC_DOCBOOK = docbook
 ASCIIDOC_EXTRA   =
 XMLTO            = xmlto
+XMLTO_EXTRA      =
 
 ifdef USE_ASCIIDOCTOR
 ASCIIDOC         = asciidoctor
 ASCIIDOC_CONF    =
 ASCIIDOC_HTML    = xhtml5
-ASCIIDOC_DOCBOOK = docbook45
+ASCIIDOC_DOCBOOK = docbook
 ASCIIDOC_EXTRA  += -I../../Documentation -rasciidoctor-extensions
 ASCIIDOC_EXTRA  += -alitdd='&\#x2d;&\#x2d;'
+XMLTO_EXTRA     += --skip-validation
 endif
 
 ifndef SHELL_PATH
@@ -78,7 +80,7 @@ install-html: $(GIT_SUBTREE_HTML)
        $(INSTALL) -m 644 $^ $(DESTDIR)$(htmldir)
 
 $(GIT_SUBTREE_DOC): $(GIT_SUBTREE_XML)
-       $(XMLTO) -m $(MANPAGE_XSL) man $^
+       $(XMLTO) -m $(MANPAGE_XSL) $(XMLTO_EXTRA) man $^
 
 $(GIT_SUBTREE_XML): $(GIT_SUBTREE_TXT)
        $(ASCIIDOC) -b $(ASCIIDOC_DOCBOOK) -d manpage $(ASCIIDOC_CONF) \