+2014-06-15 Glenn Morris <rgm@gnu.org>
+
+ * Makefile.in (CPPFLAGS): Explicitly set via configure.
+
+ * Makefile.in (mostlyclean, clean, distclean, maintainer-clean, tags):
+ Declare as PHONY.
+ (boostrap-clean): New.
+
+2013-10-24 Glenn Morris <rgm@gnu.org>
+
+ * Makefile.in (abs_top_srcdir): New, set by configure.
+
+2013-09-04 Paul Eggert <eggert@cs.ucla.edu>
+
+ Makefile improvements.
+ * Makefile.in (all, tags): Don't use double-colon rules, as they
+ are not portable according to POSIX. Mark as phony.
+