+/* Anything that tries to look like Microsoft is "Windows" */
+#if defined(OPENSSL_SYS_WIN16) || defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_WINNT)
+# undef OPENSSL_SYS_UNIX
+# define OPENSSL_SYS_WINDOWS
+# ifndef OPENSSL_SYS_MSDOS
+# define OPENSSL_SYS_MSDOS
+# endif
+#endif
+
+/* DLL settings. This part is a bit tough, because it's up to the application
+ implementor how he or she will link the application, so it requires some
+ macro to be used. */
+#ifdef OPENSSL_SYS_WINDOWS
+# ifndef OPENSSL_OPT_WINDLL
+# if defined(_WINDLL) /* This is used when building OpenSSL to indicate that
+ DLL linkage should be used */
+# define OPENSSL_OPT_WINDLL
+# endif
+# endif
+#endif
+
+/* -------------------------------- OpenVMS -------------------------------- */
+#if defined(__VMS) || defined(VMS) || defined(OPENSSL_SYSNAME_VMS)
+# undef OPENSSL_SYS_UNIX
+# define OPENSSL_SYS_VMS
+# if defined(__DECC)
+# define OPENSSL_SYS_VMS_DECC
+# else
+# define OPENSSL_SYS_VMS_NODECC
+# endif
+#endif
+
+/* --------------------------------- OS/2 ---------------------------------- */
+#if defined(__EMX__) || defined(__OS2__)
+# undef OPENSSL_SYS_UNIX
+# define OPENSSL_SYS_OS2
+#endif
+
+/* --------------------------------- Unix ---------------------------------- */
+#ifdef OPENSSL_SYS_UNIX
+# if defined(linux) || defined(__linux__) || defined(OPENSSL_SYSNAME_LINUX)
+# define OPENSSL_SYS_LINUX
+# endif
+# ifdef OPENSSL_SYSNAME_MPE
+# define OPENSSL_SYS_MPE
+# endif
+# ifdef OPENSSL_SYSNAME_SNI
+# define OPENSSL_SYS_SNI
+# endif
+# ifdef OPENSSL_SYSNAME_ULTRASPARC
+# define OPENSSL_SYS_ULTRASPARC
+# endif
+# ifdef OPENSSL_SYSNAME_NEWS4
+# define OPENSSL_SYS_NEWS4
+# endif
+# ifdef OPENSSL_SYSNAME_MACOSX
+# define OPENSSL_SYS_MACOSX
+# endif
+# if defined(_CRAY) || defined(OPENSSL_SYSNAME_CRAY)
+# define OPENSSL_SYS_CRAY
+# endif
+# if defined(_AIX) || defined(OPENSSL_SYSNAME_AIX)
+# define OPENSSL_SYS_AIX
+# endif
+#endif
+
+/**
+ * That's it for OS-specific stuff
+ *****************************************************************************/
+
+
+/* Specials for I/O an exit */
+#ifdef OPENSSL_SYS_MSDOS
+# define OPENSSL_UNISTD_IO <io.h>
+# define OPENSSL_DECLARE_EXIT extern void exit(int);
+#else
+# define OPENSSL_UNISTD_IO OPENSSL_UNISTD
+# define OPENSSL_DECLARE_EXIT /* declared in unistd.h */
+#endif
+
+/* Definitions of OPENSSL_GLOBAL and OPENSSL_EXTERN, to define and declare
+ certain global symbols that, with some compilers under VMS, have to be
+ defined and declared explicitely with globaldef and globalref.
+ Definitions of OPENSSL_EXPORT and OPENSSL_IMPORT, to define and declare
+ DLL exports and imports for compilers under Win32. These are a little
+ more complicated to use. Basically, for any library that exports some
+ global variables, the following code must be present in the header file
+ that declares them, before OPENSSL_EXTERN is used:
+
+ #ifdef SOME_BUILD_FLAG_MACRO
+ # undef OPENSSL_EXTERN
+ # define OPENSSL_EXTERN OPENSSL_EXPORT
+ #endif
+
+ The default is to have OPENSSL_EXPORT, OPENSSL_IMPORT and OPENSSL_GLOBAL
+ have some generally sensible values, and for OPENSSL_EXTERN to have the
+ value OPENSSL_IMPORT.
+*/
+
+#if defined(OPENSSL_SYS_VMS_NODECC)
+# define OPENSSL_EXPORT globalref
+# define OPENSSL_IMPORT globalref