I am uploading a NMU to fix this. The debdiff is attached.
diff -Nru freebsd-glue-0.2.22/debian/changelog
freebsd-glue-0.2.22+nmu1/debian/changelog
--- freebsd-glue-0.2.22/debian/changelog 2016-03-05 16:44:54.000000000
+0100
+++ freebsd-glue-0.2.22+nmu1/debian/changelog 2023-08-07 01:20:16.000000000
+0200
@@ -1,3 +1,12 @@
+freebsd-glue (0.2.22+nmu1) unstable; urgency=medium
+
+ * Non-maintainer upload.
+ * Build with gcc-9. (Closes: #964661)
+ * Include #pragma once in md5.h for freebsd-buildutils.
+ * Temporarily include lorder/tsort workaround. (Closes: #964661)
+
+ -- Bastian Germann <b...@debian.org> Mon, 07 Aug 2023 01:20:16 +0200
+
freebsd-glue (0.2.22) unstable; urgency=medium
* Actually use the proper build architecture compiler
diff -Nru freebsd-glue-0.2.22/debian/control
freebsd-glue-0.2.22+nmu1/debian/control
--- freebsd-glue-0.2.22/debian/control 2016-03-05 02:08:01.000000000 +0100
+++ freebsd-glue-0.2.22+nmu1/debian/control 2023-08-07 01:18:20.000000000
+0200
@@ -7,6 +7,7 @@
Steven Chamberlain <ste...@pyro.eu.org>,
Build-Depends:
debhelper (>= 8.0),
+ gcc-9,
kfreebsd-kernel-headers (>= 10.0~3) [kfreebsd-any],
freebsd-mk,
bmake,
diff -Nru freebsd-glue-0.2.22/debian/lorder
freebsd-glue-0.2.22+nmu1/debian/lorder
--- freebsd-glue-0.2.22/debian/lorder 1970-01-01 01:00:00.000000000 +0100
+++ freebsd-glue-0.2.22+nmu1/debian/lorder 2023-08-07 01:20:16.000000000
+0200
@@ -0,0 +1,2 @@
+#!/bin/sh
+echo $@
diff -Nru freebsd-glue-0.2.22/debian/rules freebsd-glue-0.2.22+nmu1/debian/rules
--- freebsd-glue-0.2.22/debian/rules 2016-03-05 01:54:10.000000000 +0100
+++ freebsd-glue-0.2.22+nmu1/debian/rules 2023-08-07 01:20:16.000000000
+0200
@@ -6,7 +6,7 @@
# Determine host architecture compiler
DEB_HOST_GNU_TYPE ?= $(shell dpkg-architecture -qDEB_HOST_GNU_TYPE)
ifeq ($(origin CC),default)
-CC := $(DEB_HOST_GNU_TYPE)-gcc
+CC := $(DEB_HOST_GNU_TYPE)-gcc-9
endif
# Determine build architecture compiler
@@ -23,7 +23,7 @@
endif
DESTDIR = $(CURDIR)/debian/tmp
-PATH := /usr/lib/freebsd:$(PATH)
+PATH := $(CURDIR)/debian:/usr/lib/freebsd:$(PATH)
PMAKE := \
MAKEFLAGS=$(BSD_MAKEFLAGS) \
MAKEOBJDIRPREFIX=$(CURDIR)/obj-deb \
diff -Nru freebsd-glue-0.2.22/debian/tsort freebsd-glue-0.2.22+nmu1/debian/tsort
--- freebsd-glue-0.2.22/debian/tsort 1970-01-01 01:00:00.000000000 +0100
+++ freebsd-glue-0.2.22+nmu1/debian/tsort 2023-08-07 01:20:16.000000000
+0200
@@ -0,0 +1,2 @@
+#!/bin/sh
+sort $@
diff -Nru freebsd-glue-0.2.22/include/md5.h
freebsd-glue-0.2.22+nmu1/include/md5.h
--- freebsd-glue-0.2.22/include/md5.h 2014-08-25 21:40:17.000000000 +0200
+++ freebsd-glue-0.2.22+nmu1/include/md5.h 2023-08-07 01:20:16.000000000
+0200
@@ -1 +1,2 @@
+#pragma once
#include <bsd/md5.h>
