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+The libffi library provides a portable, high level programming
+interface to various calling conventions. This allows a
+programmer to call any function specified by a call interface
+description at run-time.
+
+FFI stands for Foreign Function Interface. A foreign function
+interface is the popular name for the interface that allows code
+written in one language to call code written in another language.
+The libffi library really only provides the lowest, machine dependent
+layer of a fully featured foreign function interface. A layer must
+exist above libffi that handles type conversions for values passed
+between the two languages.