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Date: Mon, 02 Apr 2018 17:37:00 -0000
From: Samuel Thibault <samuel.thibault@gnu.org>
To: "H.J. Lu" <hjl.tools@gmail.com>, Joseph Myers <joseph@codesourcery.com>,
	Florian Weimer <fweimer@redhat.com>,
	Thomas Schwinge <thomas@codesourcery.com>,
	GNU C Library <libc-alpha@sourceware.org>, bug-hurd@gnu.org,
	David Michael <fedora.dm0@gmail.com>
Subject: Re: Upstreaming the glibc Hurd port
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Samuel Thibault, on lun. 02 avril 2018 19:35:11 +0200, wrote:
> > configure:4096: checking lex library
> > configure:4110: gcc -o conftest -g -O2   conftest.c   >&5
> > /usr/local/bin/ld: /tmp/ccDAnO2r.o: in function `input':
> > /export/gnu/import/git/toolchain/build/compilers/i686-gnu/mig/lex.yy.c:1185:
> > undefined reference to `yywrap'
> > /usr/local/bin/ld: /tmp/ccDAnO2r.o: in function `yylex':
> > /export/gnu/import/git/toolchain/build/compilers/i686-gnu/mig/lex.yy.c:879:
> > undefined reference to `yywrap'
> > /usr/local/bin/ld: /tmp/ccDAnO2r.o: in function `main':
> > /export/gnu/import/git/toolchain/build/compilers/i686-gnu/mig/conftest.l:18:
> > undefined reference to `yywrap'
> > collect2: error: ld returned 1 exit status
> > configure:4110: $? = 1
> > ....
> > configure:4460: result: no
> 
> Please really post config.log (or send it privately). "result: no" here
> is not related to "checking lex library".

I guess you don't have libfl-devel on your system, and apparently
autoconf's programs.m4 doesn't actually handle that case.

Samuel