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+Adding new libraries
+--------------------
+
+When adding a new sub-library to OpenSSL, assign it a library number
+ERR_LIB_XXX, define a macro XXXerr() (both in err.h), add its
+name to ERR_str_libraries[] (in crypto/err/err.c), and add
+ERR_load_XXX_strings() to the ERR_load_crypto_strings() function
+(in crypto/err/err_all.c). Finally, add an entry:
+
+    L      XXX     xxx.h   xxx_err.c
+
+to crypto/err/openssl.ec, and add xxx_err.c to the Makefile.
+Running make errors will then generate a file xxx_err.c, and
+add all error codes used in the library to xxx.h.
+
+Additionally the library include file must have a certain form.
+Typically it will initially look like this:
+
+    #ifndef HEADER_XXX_H
+    #define HEADER_XXX_H
+
+    #ifdef __cplusplus
+    extern "C" {
+    #endif
+
+    /* Include files */
+
+    #include <openssl/bio.h>
+    #include <openssl/x509.h>
+
+    /* Macros, structures and function prototypes */
+
+
+    /* BEGIN ERROR CODES */
+
+The BEGIN ERROR CODES sequence is used by the error code
+generation script as the point to place new error codes, any text
+after this point will be overwritten when make errors is run.
+The closing #endif etc will be automatically added by the script.
+
+The generated C error code file xxx_err.c will load the header
+files stdio.h, openssl/err.h and openssl/xxx.h so the
+header file must load any additional header files containing any
+definitions it uses.