Build fails with implicit declaration of function and unrecognized command line option errors

I'm trying to build openwebrtc on centos 7.

I have gcc-4.8.5, libnice-10.5.0 and other dependencies in the custom prefix.
Autotools runs successfully, but compilation stage fails with error:
```
CC owr_transport_agent.lo
owr_transport_agent.c: In function 'on_local_candidate_change':
owr_transport_agent.c:2441:5: error: implicit declaration of function 'nice_agent_set_local_credentials' [-Werror=implicit-function-declaration]
nice_agent_set_local_credentials(transport_agent->priv->nice_agent, stream_id, ufrag, password);
^
owr_transport_agent.c: At top level:
cc1: error: unrecognized command line option "-Wno-parentheses-equality" [-Werror]
cc1: all warnings being treated as errors
```
`-Wno-parentheses-equality` is clang option, but with clang it fails with other error:
`argument unused during compilation: '-L/myprefix/lib'`
Disabling -Werror entails linker error: undefined reference to `nice_agent_set_local_credentials`.

Start with owr_transport_agent.c at the nice_agent_set_local_credentials call and inspect the Autotools configuration that adds -Wno-parentheses-equality. Check how the configured libnice headers and library expose that function, then compare GCC and Clang builds on the reported CentOS 7 dependency setup. Done means the compilation and link stages complete without the reported option, declaration, or undefined-reference errors.

Written by the indexing model from the issue text.