linker error on MinGW build

Hello,

I try to build OpenAL under MinGW and get the linker errors:

Linking C shared library OpenAL32.dll
Creating library file: libOpenAL32.dll.a
CMakeFiles\OpenAL32.dir/objects.a(alError.obj):alError.c:(.text+0x27): undefined  reference to `__sync_bool_compare_and_swap_4'
CMakeFiles\OpenAL32.dir/objects.a(ALc.obj):ALc.c:(.text+0x24c): undefined reference to `__sync_bool_compare_and_swap_4'
CMakeFiles\OpenAL32.dir/objects.a(ALc.obj):ALc.c:(.text+0xff1): undefined reference to `__sync_bool_compare_and_swap_4'
CMakeFiles\OpenAL32.dir/objects.a(ALc.obj):ALc.c:(.text+0x14cd): undefined reference to `__sync_bool_compare_and_swap_4'
CMakeFiles\OpenAL32.dir/objects.a(ALc.obj):ALc.c:(.text+0x20d8): undefined reference to `__sync_add_and_fetch_4'
CMakeFiles\OpenAL32.dir/objects.a(ALc.obj):ALc.c:(.text+0x2174): undefined reference to `__sync_sub_and_fetch_4'
CMakeFiles\OpenAL32.dir/objects.a(ALc.obj):ALc.c:(.text+0x30d9): undefined reference to `__sync_bool_compare_and_swap_4'
CMakeFiles\OpenAL32.dir/objects.a(ALc.obj):ALc.c:(.text+0x3d1c): undefined reference to `__sync_add_and_fetch_4'
CMakeFiles\OpenAL32.dir/objects.a(ALc.obj):ALc.c:(.text+0x3dcd): undefined reference to `__sync_sub_and_fetch_4'
CMakeFiles\OpenAL32.dir/objects.a(ALc.obj):ALc.c:(.text+0x3f7d): undefined reference to `__sync_bool_compare_and_swap_4'
CMakeFiles\OpenAL32.dir/objects.a(ALc.obj):ALc.c:(.text+0x3fbb): undefined reference to `__sync_bool_compare_and_swap_4'
CMakeFiles\OpenAL32.dir/objects.a(helpers.obj):helpers.c:(.text+0x64a): undefined reference to `__sync_add_and_fetch_4'
CMakeFiles\OpenAL32.dir/objects.a(helpers.obj):helpers.c:(.text+0x688): undefined reference to `__sync_sub_and_fetch_4'
CMakeFiles\OpenAL32.dir/objects.a(helpers.obj):helpers.c:(.text+0x6bb): undefined reference to `__sync_add_and_fetch_4'
CMakeFiles\OpenAL32.dir/objects.a(helpers.obj):helpers.c:(.text+0x703): undefined reference to `__sync_sub_and_fetch_4'

I get the source from the Git repo and run cmake to create MinGW Makefile, after that I run mingw32-make and get the linker error.
How can I fix the build?

Thanks

Phil
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