The C header files (.H) that contain the prototypes for these
APIs are found in SSL$ROOT:[INCLUDE]. A logical name, SSL$INCLUDE,
allows you to access this directory. The logical name OPENSSL, which
points to SSL$INCLUDE, is provided so that applications can use
statements similar to the following:
NOTE: Do not confuse the OPENSSL logical name with the OPENSSL
foreign symbol. The foreign symbol provides access to the OpenSSL
command line interface.