[users@httpd] how to include ssl lib when running apxs

[eeadev dev]

I am compiling my apache c module using this

sudo apxs -i -a -c mod_ex.c

now I need to use the lib openssl

what should I use to include this lib,

I tried with adding this option:

-I /usr/include/openssl

but it still seems that it does find some function.

Please how shall I do to include it?