From ed651bf96f558fd6514d8301c813a175a8a1c51b Mon Sep 17 00:00:00 2001
From: Robin Haberkorn <robin.haberkorn@googlemail.com>
Date: Wed, 20 Aug 2025 07:33:51 +0000
Subject: support Groff v1.19.2 as still used by default on NetBSD 10

* They have a newer version in pkgsrc, but it's not even available
  as a binary package on the arm6.
* Has some glitches, e.g. does accept the ASCII 27 in tutorial.ms,
  but it's probably not worth to work around.
---
 configure.ac | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index 23d02b5..9d5e059 100644
--- a/configure.ac
+++ b/configure.ac
@@ -115,6 +115,14 @@ if [[ x$GROFF = x ]]; then
 	AC_MSG_ERROR([GNU roff required!])
 fi
 
+# preconv was added only in Groff v1.20, which is still missig
+# in NetBSD.
+AC_CHECK_PROG(PRECONV, preconv, preconv)
+if [[ x$PRECONV != x ]]; then
+	GROFF_FLAGS="-Kutf-8"
+fi
+AC_SUBST(GROFF_FLAGS)
+
 # Doxygen is not necessarily required as long as
 # you do not run `make devdoc`.
 AC_CHECK_PROG(DOXYGEN, doxygen, doxygen)
-- 
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