Index: Makefile.conf.in
===================================================================
--- Makefile.conf.in	(revision 28131)
+++ Makefile.conf.in	(revision 28132)
@@ -1,3 +1,9 @@
+# calculate the /local/confdir: either specified conf-time or compatibility fallback
+switch /local/confdir
+	case {^$}  put /local/confdir_final_m [@@/local/prefix@/share/pcb-rnd@]; end
+	default    put /local/confdir_final_m /local/confdir; end
+end
+
 print [@# generated by ./configure, do not modify
 
 # Compatibility with autotools on DESTDIR - Debian really wants this
@@ -8,9 +14,9 @@
 DOCDIR=$(Install_root)@/local/prefix@/share/doc/pcb-rnd
 LIBDIR=$(Install_root)@/local/prefix@/lib/pcb-rnd
 BINDIR=$(Install_root)@/local/prefix@/bin
-ETCDIR=$(Install_root)/etc
 DATADIR=$(Install_root)@/local/prefix@/share/pcb-rnd
 MAN1DIR=$(Install_root)@/local/prefix@@/local/man1dir@
+CONFDIR=$(Install_root)@/local/confdir_final_m@
 RM=@/host/fstools/rm@
 CP=@/host/fstools/cp@
 LN=@/host/fstools/ln@