From: vagrant@reproducible-builds.org
Subject: Use relative symlinks when linking to headers.
Date: 2020-09-24

Using the absolute build path only works during the build; the
symlinks are included in the tarball, which results in broken symlinks
in the tarball included in the bluez-source package.

Index: bluez/Makefile.am
===================================================================
--- bluez.orig/Makefile.am
+++ bluez/Makefile.am
@@ -612,7 +612,7 @@ $(lib_libbluetooth_la_OBJECTS): $(local_
 
 lib/bluetooth/%.h: lib/%.h
 	$(AM_V_at)$(MKDIR_P) lib/bluetooth
-	$(AM_V_GEN)$(LN_S) -f $(abspath $<) $@
+	$(AM_V_GEN)$(LN_S) -f ../$(shell basename $@) $@
 
 ell/internal: Makefile
 	$(AM_V_at)$(MKDIR_P) ell