+/*
+ * Declarations and constants specific to an installation.
+ * Unix Version 6.
+ */
+
+#define MAIL "/bin/mail" /* Name of mail sender */
+#define EDITOR "/usr/ucb/ex" /* Name of text editor */
+#define VISUAL "/usr/ucb/vi" /* Name of display editor */
+#define HELPFILE "/usr/lib/Mail.help"
+ /* Name of casual help file */
+#define THELPFILE "/usr/lib/Mail.help.~"
+ /* Name of casual tilde help */
+#define UIDMASK 0377 /* Significant uid bits */
+#define MASTER "/usr/lib/Mail.rc"
+#define stat _stat /* Simulate version 7 */
+#define fstat _fstat /* Simulate version 7 */
+
+/*
+ * Machine dependent type declarations.
+ */
+
+typedef int flag_t; /* flag arguments everywhere */