clang-3.1 build fails to find dispatch/dispatch.h on Leopard

[yaseppochi (Stephen J. Turnbull)]

I'd be really sad if the answer "recent clang isn't going to support Leopard".

Mac OS X 10.5.8
port 2.0.99

error like this:

:info:build make[4]: Entering directory `/opt/local/var/macports/build/_Users_steve_src_MacPorts_dports_lang_clang-3.1/clang-3.1/work/trunk/projects/compiler-rt
:info:build   COMPILE:  clang_darwin/asan_osx/i386: /opt/local/var/macports/build/_Users_steve_src_MacPorts_dports_lang_clang-3.1/clang-3.1/work/trunk/projects/compiler-rt/lib/asan/asan_interceptors.cc
:info:build /opt/local/var/macports/build/_Users_steve_src_MacPorts_dports_lang_clang-3.1/clang-3.1/work/trunk/Release+Debug+Asserts/bin/clang -no-integrated-as -ccc-install-dir /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/ -arch i386 -fvisibility=hidden -DVISIBILITY_HIDDEN -Wall -Werror -O3 -fomit-frame-pointer -mmacosx-version-min=10.5 -c -fno-exceptions -fPIC -funwind-tables -o /opt/local/var/macports/build/_Users_steve_src_MacPorts_dports_lang_clang-3.1/clang-3.1/work/trunk/tools/clang/runtime/compiler-rt/clang_darwin/asan_osx/i386/SubDir.lib__asan/asan_interceptors.o /opt/local/var/macports/build/_Users_steve_src_MacPorts_dports_lang_clang-3.1/clang-3.1/work/trunk/projects/compiler-rt/lib/asan/asan_interceptors.cc
:info:build In file included from /opt/local/var/macports/build/_Users_steve_src_MacPorts_dports_lang_clang-3.1/clang-3.1/work/trunk/projects/compiler-rt/lib/asan/asan_interceptors.cc:19:
:info:build /opt/local/var/macports/build/_Users_steve_src_MacPorts_dports_lang_clang-3.1/clang-3.1/work/trunk/projects/compiler-rt/lib/asan/asan_mac.h:22:10: fatal error: 'dispatch/dispatch.h' file not found
:info:build #include <dispatch/dispatch.h>
:info:build          ^
:info:build 1 error generated.
:info:build make[4]: *** [/opt/local/var/macports/build/_Users_steve_src_MacPorts_dports_lang_clang-3.1/clang-3.1/work/trunk/tools/clang/runtime/compiler-rt/clang_darwin/asan_osx/i386/SubDir.lib__asan/asan_interceptors.o] Error 1
:info:build make[4]: Leaving directory `/opt/local/var/macports/build/_Users_steve_src_MacPorts_dports_lang_clang-3.1/clang-3.1/work/trunk/projects/compiler-rt'
:info:build make[3]: *** [BuildRuntimeLibraries] Error 2
:info:build make[3]: Leaving directory `/opt/local/var/macports/build/_Users_steve_src_MacPorts_dports_lang_clang-3.1/clang-3.1/work/trunk/tools/clang/runtime/compiler-rt'
:info:build make[2]: *** [compiler-rt/.makeall] Error 2
:info:build make[2]: Leaving directory `/opt/local/var/macports/build/_Users_steve_src_MacPorts_dports_lang_clang-3.1/clang-3.1/work/trunk/tools/clang/runtime'
:info:build make[1]: *** [all] Error 1
:info:build make[1]: Leaving directory `/opt/local/var/macports/build/_Users_steve_src_MacPorts_dports_lang_clang-3.1/clang-3.1/work/trunk/tools/clang'
:info:build make: *** [all] Error 1
:info:build make: Leaving directory `/opt/local/var/macports/build/_Users_steve_src_MacPorts_dports_lang_clang-3.1/clang-3.1/work/trunk'
:info:build shell command " cd "/opt/local/var/macports/build/_Users_steve_src_MacPorts_dports_lang_clang-3.1/clang-3.1/work/trunk" && /usr/bin/make -w clang-only VERBOSE=1 " returned error 2