libdrm-2.4.11 and xf86-video-intel-2.7.x on DragonFly (might affect others as well)

[Hasso Tepper <hasso%netbsd.org@localhost>]

Thanks to many small hints from various sources I found out why the new 
libdrm/intel doesn't work at all on DragonFly - xorg server (probably) 
needs to be linked against libpthread - (the new?) intel_bufmgr_* code 
uses pthread mutexes.

The mesa/xserver update I posted earlier solved the issue because the Xorg 
binary gets linked against libpthread indirectly in there - via openssl.

I don't know how to solve it though. I guess that linking Xorg server 
against libpthread is the way to go (although linking libdrm library 
against libpthread would work as well on DragonFly). But what's the 
portable way to do it?


-- 
Hasso Tepper