#include <stdio.h>
#include <openssl/e_os2.h>
+/* The following defines enable the declaration of strdup(), which is an
+ extended function according to X/Open. */
#ifdef OPENSSL_SYS_VMS_DECC
# define _XOPEN_SOURCE_EXTENDED
#endif
+#ifdef OPENSSL_SYS_UNIX
+# define _XOPEN_SOURCE
+# define _XOPEN_SOURCE_EXTENDED /* For Linux and probably anything GNU */
+#endif
#include <string.h>
#include <openssl/engine.h>
#include <openssl/err.h>