[pypy-issue] Issue #2602: Unable to install pyzmq on pypy3 (pypy/pypy)

[Diego Magrini]

New issue 2602: Unable to install pyzmq on pypy3
https://bitbucket.org/pypy/pypy/issues/2602/unable-to-install-pyzmq-on-pypy3

Diego Magrini:

While trying to install pyzmq inside pypy3 (version 5.8.0) i got this error: 

```
#!bash

Undefined symbols for architecture x86_64:
      "_PyPyModule_Create2", referenced from:
          _PyInit_libsodium in initlibsodium.o
    ld: symbol(s) not found for architecture x86_64
    clang: error: linker command failed with exit code 1 (use -v to see invocation)
    error: command 'cc' failed with exit status 1
```