-SSLeay() returns this number. The return value can be compared to the
-macro to make sure that the correct version of the library has been
-loaded, especially when using DLLs on Windows systems.
+=item OPENSSL_CFLAGS
+
+The compiler flags set for the compilation process in the form
+"compiler: ..." if available or "compiler: information not available"
+otherwise.
+
+=item OPENSSL_BUILT_ON
+
+The date of the build process in the form "built on: ..." if available
+or "built on: date not available" otherwise.
+
+=item OPENSSL_PLATFORM
+
+The "Configure" target of the library build in the form "platform: ..."
+if available or "platform: information not available" otherwise.
+
+=item OPENSSL_DIR
+
+The "OPENSSLDIR" setting of the library build in the form "OPENSSLDIR: "...""
+if available or "OPENSSLDIR: N/A" otherwise.
+
+=item OPENSSL_ENGINES_DIR
+
+The "ENGINESDIR" setting of the library build in the form "ENGINESDIR: "...""
+if available or "ENGINESDIR: N/A" otherwise.
+
+=back
+
+For an unknown B<t>, the text "not available" is returned.