Folks, just for fun I've built GHC cross-compiler for ARM64 platform using LLVM backend. I've documented it here: https://ghcarm.wordpress.com/2014/01/18/unregisterised-ghc-head-build-for-ar... and I'm writing here just to ask if you think adding --with-gcc-sysroot option (or kind of it) to GHC's configure may be a good idea or not (i.e. you consider using shell script wrapper which passes --sysroot option to the GNU C cross compiler perfectly adequate for this job -- like I did in blog post above). See also #7754 which shows the same problem. Thanks! Karel