Hi, all. I checkouted libdispatch sources on libdispatch.macosforge.org svn rev-188. I built it under MacOS-X. Then, I try to run binaries in testing folder. They run, but created events are never executed (when I put a printf in async functions, I don't see it). By the way, when I do the build with standard MacOS-X libraries, the runs are good and I see my printf. Here is my configure adapted command from INSTALL file: ./configure \ --with-apple-libc-source=/Users/me/GCD/Libc-594.1.4 \ --with-apple-xnu-source=/Users/me/GCD/xnu-1504.3.12 \ --enable-legacy-api \ --disable-libdispatch-init-constructor \ --enable-apple-crashreporter-info \ --enable-apple-tsd-optimizations \ --enable-apple-semaphore-optimizations To have the build work, I had to: -add Block_private.h file -#define USE_APPLE_CRASHREPORTER_INFO 0 into config/config.h -Change __PTK_LIBDISPATCH_KEYX to Libc hard values since the symbols were no found at build I have MacOS-X 10.6.3 and Xcode 3.2.2. Do you have any idea how to make it work? Thank you, -- Fabien Mottet