19.2 Enable PIE and RELRO by default
19.3 Don't use GNU libtool on OpenBSD
19.4 Package curl for Windows in a signed installer
+ 19.5 make configure use --cache-file more and better
20. Test suite
20.1 SSL tunnel
See https://github.com/curl/curl/issues/5424
+19.5 make configure use --cache-file more and better
+
+ The configure script can be improved to cache more values so that repeated
+ invokes run much faster.
+
+ See https://github.com/curl/curl/issues/7753
+
20. Test suite
20.1 SSL tunnel