Re: [PATCH] Revert 'Fix logic error in _AC_PROG_LEX_YYTEXT_DECL (#109320)'

[Paul Eggert]

On 7/16/20 10:34 AM, Ross Burton wrote:
> Wouldn't that break cross-compilation where a host flex is present but
> target libfl isn't?  That case worked previously and should work fine,
> as libfl isn't actually that useful.

That shouldn't be a problem when building from tarballs, as flex shouldn't be 
needed then and the patch is a win because it prevents the build from failing 
unnecessarily. However, it could be a problem when building from Git 
repositories where you need flex but may well not need the library.

So I installed the attached patch, which implements Zack's first suggestion. I'm 
being somewhat bold in installing here; feel free to comment and suggest 
improvements (or suggest I revert :-).

0001-AC_PROG_LEX-no-longer-sets-LEXLIB-for-yywrap.patch
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