Use AX_PTHREAD to get the right linker params for pthread. Start of lack-of-pthreads support.
Formatting. wtf.
Oh. I need to grab the pthread m4 macro, but I'm on a plane so I can't download it. Progress commit.
Add pthread detection m4 macro.
Merge pull request #435 from ggreer/detect_pthreads

Detect pthreads