Import failed when using tensorflow version built from source #574

System information

• OS Platform and Distribution (e.g., Linux Ubuntu 16.04): Linux Ubuntu 16.04
• TensorFlow version and how it was installed (source or binary): 2.0.0 (build from source)
• TensorFlow-Addons version and how it was installed (source or binary): 0.6.0
• Python version: 3.6.8
• Is GPU used? (yes/no): yes

Describe the bug

When I install tensorflow from source code, addons cannot be imported successfully.

NotFoundError: tensorflow_addons/custom_ops/activations/_activation_ops.so: undefined symbol: _ZN10tensorflow12OpDefBuilder4AttrESs