https://gitlab.freedesktop.org/libbsd/libbsd/-/merge_requests/16

From 3fbb632b460a4f2d37036cf3959736938494459e Mon Sep 17 00:00:00 2001
From: Sam James <sam@gentoo.org>
Date: Sun, 23 Jan 2022 15:36:55 +0000
Subject: [PATCH] build: respect $(OBJDUMP)

We already search for it in `./configure` so let's respect
the result of that search.

This helps with cross-compilation and any other cases
where one might want to choose a different toolchain.

Bug: https://bugs.gentoo.org/831863
Signed-off-by: Sam James <sam@gentoo.org>
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -141,7 +141,7 @@ TRANSPARENT_LIBMD_DEPENDS = format.ld
 
 format.ld:
 	$(CC) -shared -nostdlib -nostartfiles -x assembler /dev/null -o $@.so
-	objdump -f $@.so | sed -n 's/.*file format \(.*\)/OUTPUT_FORMAT(\1)/;T;p' > $@
+	$(OBJDUMP) -f $@.so | sed -n 's/.*file format \(.*\)/OUTPUT_FORMAT(\1)/;T;p' > $@
 	rm -f $@.so
 endif