Created attachment 91255 [details] [review]
Patch replacing the check with AC_PATH_TOOL
Since llvm-config is a tool used to obtain build host paths, the check should use AC_PATH_TOOL instead of AC_PATH_PROG. This helps with cross-compiling and multilib, e.g. finding i686-pc-linux-gnu-llvm-config as necessary.
My patch has been committed already :) 
on Sep 28, 2016 at 20:37:04.
(provided by the Example extension).