-I/usr/local/openssl-3.0.7/include/

# using the system default it could stay empty; otherwise check for that

-I/usr/local/openssl-3.0.7/include/
-I/home/ucspi/_SSL/libressl-3.7.2/include/

-I/usr/kerberos/include 

# This will be used to include headers from a different version,
# or if openssl requires additional support, e.g. kerberos support on RedHat Linux.