re: version update dance

[Jeffrey Cliff]

which 2.21 ( https://ftp.gnu.org/gnu/which/which-2.21.tar.gz )
seems to expect autoconf 2.69
but 2.71 is out
updating for it to expect autoconf 2.71 might be something to consider
for the next release
( for me, autoconf suggests autoreconf, autoreconf complains of
@ACLOCAL_CWFLAGS@ )
jeff cliff
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