Index: libcfa/configure
===================================================================
--- libcfa/configure	(revision 076512189d22e106ca8cc3e7a0a6267025f6c9fa)
+++ libcfa/configure	(revision 93fe3154c52db742d025ea3dfcd69426139dc375)
@@ -2970,4 +2970,7 @@
 		CONFIG_CFAFLAGS="-nodebug"
 		CONFIG_BUILDLIB="no"
+	;;
+	*)
+	as_fn_error $? "'Invalid value $CONFIGURATION for \$CONFIGURATION'" "$LINENO" 5
 	;;
 esac
Index: libcfa/src/Makefile.in
===================================================================
--- libcfa/src/Makefile.in	(revision 076512189d22e106ca8cc3e7a0a6267025f6c9fa)
+++ libcfa/src/Makefile.in	(revision 93fe3154c52db742d025ea3dfcd69426139dc375)
@@ -922,9 +922,5 @@
 $(libobjs) : @CFACC@ @CFACPP@ prelude.cfa
 
-include $(libdeps)
-
-$(libdeps):
-	@mkdir -p $(dir $@)
-	@echo '#dummy' > $@
+-include $(libdeps)
 
 prelude.o : prelude.cfa extras.cf gcc-builtins.cf builtins.cf @CFACC@ @CFACPP@