Thanks for the report; sorry for the delayed reply.
$ uname -a
SunOS hidden 5.11 11.3 i86pc i386 i86pc
...
FAIL: t/lex-clean-cxx.sh
FAIL: t/lex-depend-cxx.sh
I surmise you are using Sun compiler tools? In any case, there have been
some previous reports of test failures on Solaris:
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=44795
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=45205
(possibly others)
A new volunteer needs to come forward to work on these issues; I just
can't devote time and energy to Solaris. Sorry about that. --karl
