Thanks for contacting wolfSSL!
Could you please elaborate on what you want to accomplish with unifdef?
You can use autotools or cmake to build wolfSSL library. wolfSSL is configured with some default configurations and they can be changed with `./configure --disable-funoption`. You can display the list of options with `./configure -h`. Configure auto-generates `wolfssl/wolfssl/options.h` containing the #define/#undef of features.
You can run the wolfcrypt, benchmark, or client/server examples.
Let me know if this helps.