Solaris: import pynacl.bindings fails with "referenced symbol not found"

I'm having trouble getting PyNaCl to work on Solaris. After installation, import fails to load the shared object `_sodium.so` with the message "symbol sodium_unpad: referenced symbol not found".

I am using the "embedded" libsodium, as I won't be able to install libsodium itself on my target machines.



I reproduces this issue on Solaris 10.11 and Solaris 11.2, on both SPARC and x64 architectures, with or without the "-m32" CFLAG (during installation), and on Python 2 and 3.



```

root@host-ci037 (SunOS 5.11) ➜  ~  pip install pynacl

Looking in indexes: https://pypi.org/simple/

Collecting pynacl

  Downloading https://files.pythonhosted.org/packages/61/ab/2ac6dea8489fa713e2b4c6c5b549cc962dd4a842b5998d9e80cf8440b7cd/PyNaCl-1.3.0.tar.gz (3.4MB)

    100% |████████████████████████████████| 3.4MB 663kB/s

  Installing build dependencies ... done

Requirement already satisfied: six in ./python/lib64/python2.7/site-packages/six-1.12.0-py2.7.egg (from pynacl) (1.12.0)

Requirement already satisfied: cffi>=1.4.1 in ./python/lib64/python2.7/site-packages/cffi-1.11.5-py2.7-solaris-2.11-i86pc.64bit.egg (from pynacl) (1.11.5)

Requirement already satisfied: pycparser in ./python/lib64/python2.7/site-packages/pycparser-2.19-py2.7.egg (from cffi>=1.4.1->pynacl) (2.19)

Installing collected packages: pynacl

  Running setup.py install for pynacl ... done

Successfully installed pynacl-1.3.0





root@host-ci037 (SunOS 5.11) ➜  ~  python -c "import nacl.bindings"

Traceback (most recent call last):

  File "<string>", line 1, in <module>

  File "/root/python/lib64/python2.7/site-packages/nacl/bindings/__init__.py", line 17, in <module>

    from nacl.bindings.crypto_aead import (

  File "/root/python/lib64/python2.7/site-packages/nacl/bindings/crypto_aead.py", line 18, in <module>

    from nacl._sodium import ffi, lib

ImportError: ld.so.1: python2.7: fatal: relocation error: file /root/python/lib64/python2.7/site-packages/nacl/_sodium.so: symbol sodium_unpad: referenced symbol not found

```



Any ideas?

Thanks

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