Follow-up Comment #4, sr #110269 (project autoconf):
I can replicate this with a minimal configure.ac:
AC_INIT([argh], [1])
AC_PROG_LEX
AC_OUTPUT([])
Flex and its headers are present.
The config.log files are effectively identical until "checking lex library",
autoconf 2.69 reports none needed but 2.70b reports not found.
Looks like this was introduced by "Fix logic error in _AC_PROG_LEX_YYTEXT_DECL
(#109320)".
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