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From: Mike Gilbert <floppym@gentoo.org>
Date: Wed, 11 Oct 2017 11:50:34 -0400
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Subject: Re: [gentoo-user] python build fail; undefined reference to pthread_*
 and sem_*
To: gentoo-user@lists.gentoo.org
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On Wed, Oct 11, 2017 at 12:16 AM, Walter Dnes <waltdnes@waltdnes.org> wrote:
>   This is happening with both python 2.7.12 and 3.4.5 on a 32-bit x86
> system.  Build logs are attached, along with "emerge --info" output.  I
> can't find anything relevant in bugzilla.

>From the build log for 3.4.5:

checking whether pthreads are available without options... yes

This is clearly a lie; glibc requires that you pass "-pthread" to gcc
to enable pthreads. For some reason, configure is mis-detecting this.

I would try rebuilding with minimal CFLAGS.