clang-3.7 @3.7-r241984 fails building on 10.6.8

[udbraumann]

Though ​https://trac.macports.org/ticket/47729 apparently could resolve ​https://trac.macports.org/ticket/47241, I still cannot build clang-3.7 @3.7-r241984 on 10.6.8 issuing a similar error:

...
:info:build cp /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_lang_llvm-3.7/clang-3.7/work/build/tools/clang/runtime/compiler-rt/clang_macho_embedded/hard_pic/libcompiler_rt.a /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_lang_llvm-3.7/clang-3.7/work/build/Release+Debug+Asserts/lib/clang/3.7.0/lib/macho_embedded/libclang_rt.hard_pic.a
:info:build cp: /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_lang_llvm-3.7/clang-3.7/work/build/tools/clang/runtime/compiler-rt/clang_darwin/asan_iossim_dynamic/libcompiler_rt.dylib: No such file or directory
:info:build llvm[3]: Copying runtime library macho_embedded/soft_static to build dir
:info:build llvm[3]: Copying runtime library macho_embedded/soft_pic to build dir
:info:build make[3]: *** [/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_lang_llvm-3.7/clang-3.7/work/build/Release+Debug+Asserts/lib/clang/3.7.0/lib/darwin/libclang_rt.asan_iossim_dynamic.dylib] Error 1
:info:build make[3]: *** Waiting for unfinished jobs....
:info:build cp /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_lang_llvm-3.7/clang-3.7/work/build/tools/clang/runtime/compiler-rt/clang_macho_embedded/soft_pic/libcompiler_rt.a /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_lang_llvm-3.7/clang-3.7/work/build/Release+Debug+Asserts/lib/clang/3.7.0/lib/macho_embedded/libclang_rt.soft_pic.a
:info:build cp: /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_lang_llvm-3.7/clang-3.7/work/build/tools/clang/runtime/compiler-rt/clang_darwin/ubsan_iossim_dynamic/libcompiler_rt.dylib: No such file or directory
:info:build make[3]: *** [/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_lang_llvm-3.7/clang-3.7/work/build/Release+Debug+Asserts/lib/clang/3.7.0/lib/darwin/libclang_rt.ubsan_iossim_dynamic.dylib] Error 1
...