* GNUmakefile: Add $(srcdir)/ prefix to git-version-gen and argument.
ifeq (0,$(MAKELEVEL))
_is-dist-target = $(filter dist% alpha beta major,$(MAKECMDGOALS))
ifneq (,$(_is-dist-target))
- _curr-ver := $(shell build-aux/git-version-gen .tarball-version)
+ _curr-ver := $(shell $(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 rm -rf autom4te.cache; autoreconf)