+20210508
+ + modify tputs' error check to allow it to be used without first
+ calling tgetent or setupterm, noting that terminfo initialization
+ is requires for supporting the terminfo delay feature (report by
+ Sebastiano Vigna).
+ + fix several warnings from clang --analyze
+ + add null-pointer check in comp_parse.c, when a "use=" clause refers
+ to a nonexisting terminal description (report/patch by Miroslav
+ Lichvar, cf: 20210227).
+
+20210501
+ + add a special case in the configure script to work around one of the
+ build-time breakages reported for OpenBSD 6 here:
+ https://www.mail-archive.com/bugs@openbsd.org/msg13200.html
+ There is no workaround for the other issue, a broken linker spec.
+ + modify configure check for libtool to prevent accidental use of an
+ OpenBSD program which uses the same name.
+ + update config.guess, config.sub
+
+20210424
+ + avoid using broken system macros for snprintf which interfere with
+ _nc_SLIMIT's conditionally adding a parameter when the string-hacks
+ configure option is enabled.
+ + add a "all::" rule before the new "check" rule in test/Makefile.in
+