building 'manpages' target because there is already 'manpages' directory and
some make versions are very sensible to what particular file system reports as
timestamp for the file or a directory.
In particular, this behaviour is reproduceable on some 2.4 kernels with Ext3.
Thanks to Dmitry Levin <ldv@altlinux.org> for spotting the bug and providing the
fix.
# Always keep intermediate files if we can
.SECONDARY:
-.PHONY: clean clobber archive release everything all
+.PHONY: clean clobber archive release everything all $(TARGETS)