From edae09f52109d240facd2c71c2f13c062ed084ad Mon Sep 17 00:00:00 2001
From: Alejandro Colomar <alx@kernel.org>
Date: Tue, 16 Apr 2024 03:35:04 +0200
Subject: share/mk/: build-pdf-book: Fix chapter bookmarks

So that they can be folded.

Suggested-by: Deri James <deri@chuzzlewit.myzen.co.uk>
Cc: "G. Branden Robinson" <branden@debian.org>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
---
 share/mk/build/pdf/book/_.mk | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/share/mk/build/pdf/book/_.mk b/share/mk/build/pdf/book/_.mk
index ea7c081fd..51d0a7d69 100644
--- a/share/mk/build/pdf/book/_.mk
+++ b/share/mk/build/pdf/book/_.mk
@@ -38,7 +38,8 @@ $(_PDF_BOOK): $(_MANPAGES) $(_TINOS) $(MKBOOK) $(MK) | $$(@D)/
 	| $(PIC) \
 	| $(TBL) \
 	| $(EQN) -Tpdf \
-	| $(TROFF) -mandoc -Tpdf -F$(_FONTSDIR) -dpaper=a4 -rC1 $(TROFFFLAGS) \
+	| $(TROFF) -mandoc -Tpdf -F$(_FONTSDIR) -dpaper=a4 -rC1 \
+		-ran*bookmark-base-level=1 $(TROFFFLAGS) \
 	| $(GROPDF) -F$(_FONTSDIR) -pa4 $(GROPDFFLAGS) \
 	| $(SPONGE) $@
 
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