Dear all: This is a quick update for those interested in the general portability of libdispatch, and perhaps specifically FreeBSD. With a bit of help from Jordan Hubbard, I now have libdispatch working with Blocks on FreeBSD. Jordan has put up a FreeBSD clang-devel package that includes Blocks parts and the C runtime bits here: http://static.macosforge.org/libdispatch/downloads/clang-devel.tgz I've updated the libdispatch build parts to detect and use Blocks when compiled with clang, and fixed a few nits in libdispatch that I ran into along the way (and one apparent clang bug). With Jordan's package as a starting point, Blocks pretty much "just worked", so I'm optimistic that people will be able to reproduce this on other platforms able to run the non-Blocks libdispatch without much difficulty. If you update to at least r45 of libdispatch, you should now be able to do: CC=clang ./configure --with-blocks-runtime=/usr/local/lib and get a libdispatch with Blocks support. The reason for the configure argument is that the current clang-devel package doesn't automatically add libBlocksRuntime dependency for binaries compiled with -fblocks. Once Blocks support shakes out a bit more in clang/FreeBSD, this should go away. I am able to run basic Blocks-based test tools with GCD on FreeBSD without difficulty. The FreeBSD port should be updated to reflect this shortly. Robert N M Watson Computer Laboratory University of Cambridge