On 22 May 2011, at 16:21, Ivan Maidanski wrote: > I've run ./configure (without any options) on iPhone and it generated config.h with GC_DARWIN_THREADS on, so multi-threading is on by default. It is the same on Mac OS X 10.6.7 (another OS). I also compiled it, and it worked with guile-2.0.1, though I did not recompile the latter. Hans