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From: Mike Gilbert <floppym@gentoo.org>
Date: Mon, 27 Nov 2017 12:48:26 -0500
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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 Mon, Nov 27, 2017 at 11:47 AM, Walter Dnes <waltdnes@waltdnes.org> wrote:
> On Wed, Oct 11, 2017 at 10:15:50PM -0400, Walter Dnes wrote
>> On Wed, Oct 11, 2017 at 11:56:21AM -0400, Mike Gilbert wrote
>>
>> > I can reproduce the issue by adding -fopenmp to my CFLAGS. You can
>> > work around it by adding -fopenmp to LDFLAGS as well.
>>
>>   Thanks.  The following workaround makes python build properly.
>>
>> LDFLAGS="-fopenmp" emerge =dev-lang/python-2.7.12 =dev-lang/python-3.4.5
>>
>> > This is probably a bug in the Python build system; it should probably
>> > be passing CFLAGS to gcc when linking libpython.
>>
>>   Bug https://bugs.gentoo.org/634064 filed.
>
>   Bump; I had to...
>
> LDFLAGS="-fopenmp" emerge -1 =dev-lang/python-2.7.14 =dev-lang/python-3.5.4
>
> ..to get the latest pythons to build properly.

Just stick it in make.conf and call it fixed.

You can track further updates via the bug report.