diff -r 71c04702a3d5 -r 72e3ae9a25eb make/autoconf/spec.gmk.in
--- a/make/autoconf/spec.gmk.in	Tue Sep 12 19:03:39 2017 +0200
+++ b/make/autoconf/spec.gmk.in	Tue Sep 12 19:03:56 2017 +0200
@@ -857,6 +857,8 @@
 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