How to include external library symbols in setup.py

[sroy9gmu]

I created a new C file newfile.c inside pycryptodome/src directory. Inside newfile.c, I created a new function newfunction() to be exported as a raw C API, which will be called inside the encrypt function of Crypto/Cipher/PKCS1_OAEP.py file as shown below:

result = _raw_newfile_lib.newfunction(<list of C-compatible arguments>)

Everything works till I try to invoke an external shared library function of OpenSSL inside newfunction(). The linker fails unable to locate this BN_CTX_new symbol, even after compiling and installing the updated pycryptodome binaries using -lcrypto. But I can successfuly invoke the BN_CTX_new() inside main() of newfile.c.

How can I get the pycryptodome's setup.py script to load and link such external shared library symbols inside C raw APIs?