-#ifdef NO_MD2
-#define MD2_Init MD2Init
-#define MD2_Update MD2Update
-#define MD2_Final MD2Final
-#define MD2_DIGEST_LENGTH 16
+#if defined(OPENSSL_SYS_WINDOWS)
+# define strcasecmp _stricmp
+# define strncasecmp _strnicmp
+#elif defined(OPENSSL_SYS_VMS)
+/* VMS below version 7.0 doesn't have strcasecmp() */
+# include <openssl/o_str.h>
+# define strcasecmp OPENSSL_strcasecmp
+# define strncasecmp OPENSSL_strncasecmp
+#elif defined(OPENSSL_SYS_OS2) && defined(__EMX__)
+# define strcasecmp stricmp
+# define strncasecmp strnicmp
+#else
+# ifdef NO_STRINGS_H
+ int strcasecmp();
+ int strncasecmp();
+# else
+# include <strings.h>
+# endif /* NO_STRINGS_H */
+#endif
+
+#if defined(OPENSSL_SYS_OS2) && defined(__EMX__)
+# include <io.h>
+# include <fcntl.h>
+# define NO_SYSLOG
+#endif
+
+/* vxworks */
+#if defined(OPENSSL_SYS_VXWORKS)
+#include <ioLib.h>
+#include <tickLib.h>
+#include <sysLib.h>
+
+#define TTY_STRUCT int
+
+#define sleep(a) taskDelay((a) * sysClkRateGet())
+#if defined(ioctlsocket)
+#undef ioctlsocket