You are missing the gnu synchronisation primitives.  Are you using  
MSVC or gcc?

Quoting Rory Walsh <rorywalsh@ear.ie>:

> On windows when I try to build the latest tip I get the following
> errors? Any ideas?
>
> [ 72%] Building C object CMakeFiles/csound64.dir/Engine/cs_par_dispatch.c.obj
> Linking C shared library csound64.dll
> Creating library file: libcsound64.dll.a
> CMakeFiles\csound64.dir/objects.a(cs_new_dispatch.c.obj):cs_new_dispatch.c:(.tex
> t+0xd0b): undefined reference to `__sync_bool_compare_and_swap_4'
> CMakeFiles\csound64.dir/objects.a(cs_new_dispatch.c.obj):cs_new_dispatch.c:(.tex
> t+0xd36): undefined reference to `__sync_fetch_and_or_4'
> CMakeFiles\csound64.dir/objects.a(cs_new_dispatch.c.obj):cs_new_dispatch.c:(.tex
> t+0xd92): undefined reference to `__sync_fetch_and_or_4'
> CMakeFiles\csound64.dir/objects.a(cs_new_dispatch.c.obj):cs_new_dispatch.c:(.tex
> t+0xdce): undefined reference to `__sync_bool_compare_and_swap_4'
> CMakeFiles\csound64.dir/objects.a(cs_new_dispatch.c.obj):cs_new_dispatch.c:(.tex
> t+0xe2b): undefined reference to `__sync_fetch_and_or_4'
> CMakeFiles\csound64.dir/objects.a(cs_new_dispatch.c.obj):cs_new_dispatch.c:(.tex
> t+0xe59): undefined reference to `__sync_bool_compare_and_swap_4'
> CMakeFiles\csound64.dir/objects.a(cs_new_dispatch.c.obj):cs_new_dispatch.c:(.tex
> t+0xedb): undefined reference to `__sync_fetch_and_or_4'
> collect2.exe: error: ld returned 1 exit status
> CMakeFiles\csound64.dir\build.make:5775: recipe for target  
> `csound64.dll' failed
>
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