** The configure options '--enable-checking=conslist' and
'--enable-checking=xmallocoverrun' have been withdrawn. The former
made Emacs irredeemably slow, and the latter made it crash. Neither
-option was useful with modern debugging tools such as AddressSanitizer
-(see etc/DEBUG).
+option was useful with modern debugging tools such as AddressSanitizer.
+(See etc/DEBUG for the details of using the modern replacements of the
+removed configure options.)
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** Emacs now requires GTK 2.24 and GTK 3.10 for the GTK 2 and GTK 3