+20190630
+ + add --with-tic-path and --with-infocmp-path to work around problems
+ building fallback source using pre-6.0 tic/infocmp.
+ + add a check in tic for paired indn/rin
+ + correct a buffer-limit in write_entry.c for systems that use caseless
+ filenames.
+ + add ms-terminal -TD
+ + add vscode, vscode-direct -TD
+
+20190623
+ + improve the tabs.1 manual page to distinguish the PWB/Unix and 7th
+ Edition versions of the tabs utility.
+ + add configure check for getenv() to work around implementation shown
+ in Emscripten #6766, use that to optionally suppress START_TRACE
+ macro, whose call to getenv() may not work properly (report by Ilya
+ Ig Petrov).
+ + modify initialization functions to avoid relying upon persistent
+ data for the result from getenv().
+ + update config.guess, config.sub
+
+20190615
+ + expand the portability section of the man/tabs.1 manual page.
+ + regenerate HTML manpages.
+