cmake option WITH_SSL=OFF implies failure at compile time

Build #1: with SSL support

1. configured the mariadb connector C without SSL support using the option -DWITH_SSL=ON => success
2. built with make => success

This setup builds and installs on Ubuntu using OpenSSL 3.0.2 :
{{...
– SSL support: OPENSSL Libs: /usr/lib/x86_64-linux-gnu/libssl.so;/usr/lib/x86_64-linux-gnu/libcrypto.so
...}}

Build #2: no SSL support

1. configured the mariadb connector C without SSL support using the option -DWITH_SSL=OFF => success
2. built with make => failure (log attached)

Despite no SSL feature is requested, it seems some parts of the source code still rely on some SSL/TLS-based authentication features and API. Naive attempts to fix the problem failed:
#  force the declaration of MA_HASH_CTX struct in ma_crypt.h

1. remove -Werror in the CMake file...

Finally it seems not possible to build the lib without SSL.
I have also noticed that the WITH_SSL CMake variable can be used both as a boolean and a string value (ON/OFF/GNUTLS...) which is confusing IMHO.