From mboxrd@z Thu Jan  1 00:00:00 1970
From: Anssi Saari <as@sci.fi>
Subject: Re: org-babel C math.h issue
Date: Fri, 11 Mar 2016 08:44:51 +0200
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Nick Dokos <ndokos@gmail.com> writes:

> You can test that that's the case: put your program into a file, say foo.c, and
> execute
>
>   gcc -o foo.out -lm foo.c
>
> Does that give you undefined references?

Does for me. gcc --version says
gcc (Ubuntu 4.8.4-2ubuntu1~14.04) 4.8.4

So is it gcc that has changed then?