getopt configure check fails in linux

[Lorenzo Bettini]

Hi

I've just updated gnulib and updated my modules (strdup and getopt) and 
I see that now configure says in Linux

checking getopt.h usability... yes
checking getopt.h presence... yes
checking for getopt.h... yes
checking for stddef.h... (cached) yes
checking for string.h... (cached) yes
checking for unistd.h... (cached) yes
checking for getopt.h... (cached) yes
checking for getopt_long_only... yes
checking whether optreset is declared... no
checking whether getopt_clip is declared... no
checking whether getopt is POSIX compatible... yes
checking for working GNU getopt function... no

it looks kind of strange that getopt test fails under GNU Linux...

(indeed, this way, the gnulib version of getopt is used, instead of GNU 
libc version)

cheers
        Lorenzo

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Lorenzo Bettini, PhD in Computer Science, DI, Univ. Torino
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