--- old/make/autoconf/spec.gmk.in	2017-10-13 12:10:01.654475258 +0200
+++ new/make/autoconf/spec.gmk.in	2017-10-13 12:10:01.410479157 +0200
@@ -842,8 +842,6 @@
 TEST_BUNDLE :=  $(BUNDLES_OUTPUTDIR)/$(TEST_BUNDLE_NAME)
 DOCS_BUNDLE :=  $(BUNDLES_OUTPUTDIR)/$(DOCS_BUNDLE_NAME)
 
-CONFIGURE_CMD := $(TOPDIR)/configure
-
 # This macro is called to allow inclusion of closed source counterparts.
 # Unless overridden in closed sources, it expands to nothing.
 # Usage: This function is called in an open makefile, with the following