+# Allow cfg.mk to override these.
+_build-aux ?= build-aux
+_autoreconf ?= autoreconf
+
+# Ensure that $(VERSION) is up to date for dist-related targets, but not
+# for others: rerunning autoreconf and recompiling everything isn't cheap.
+_have-git-version-gen := \
+ $(shell test -f $(srcdir)/$(_build-aux)/git-version-gen && echo yes)
+ifeq ($(_have-git-version-gen)0,yes$(MAKELEVEL))
+ _is-dist-target = $(filter-out %clean, \
+ $(filter maintainer-% dist% alpha beta major,$(MAKECMDGOALS)))
+ ifneq (,$(_is-dist-target))
+ _curr-ver := $(shell cd $(srcdir) && ./$(_build-aux)/git-version-gen \
+ $(srcdir)/.tarball-version)
+ ifneq ($(_curr-ver),$(VERSION))
+ $(info INFO: running autoreconf for new version string: $(_curr-ver))
+ _dummy := $(shell cd $(srcdir) && rm -rf autom4te.cache .version \
+ && $(_autoreconf))
+ endif
+ endif
+endif
+