my suggestion would be:

```python
custom_paths = {
    'files': ["bin/clang-%s" % self.version, "bin/lli", "bin/llvm-ar", "bin/llvm-as", "bin/opt"] + 
             ["lib/libclang.so", "lib/libLLVMCore.a", "lib/libLTO.a"],
    'dirs': ["include/clang", "include/llvm", "include/llvm-c", "lib/clang/%s/lib" % self.version],
}
```

feel free to add `llvm-symbolizer` too, but the other seems more basic/important?