[PATCH libdrm] tests: Add -lm to LDADD for dristat

[Emil Velikov]

On 7 September 2015 at 11:02, Michel Dänzer <michel at daenzer.net> wrote:
> From: Michel Dänzer <michel.daenzer at amd.com>
>
> Fixes build failure due to unresolved log2.
>
Sigh I've completely forgot that we still have the #include
"xf86drm.c" hack around.

I'll resent the patch that nukes it shortly but until that gets
reviewed this fix will be living in master.

Thanks
Emil