diff --git a/acconfig.h b/acconfig.h
index 0f79c6c22e3..8432f1fa725 100644
--- a/acconfig.h
+++ b/acconfig.h
@@ -242,3 +242,11 @@
 #define DL_EXPORT(RTYPE) __declspec(dllexport) RTYPE
 #endif
 #endif
+
+/* Define the macros needed if on a UnixWare 7.x system. */
+#if defined(__USLC__) && defined(__SCO_VERSION__)
+#define SCO_ACCEPT_BUG     /* Use workaround for UnixWare accept() bug */
+#define SCO_ATAN2_BUG      /* Use workaround for UnixWare atan2() bug */
+#define STRICT_SYSV_CURSES /* Don't use ncurses extensions */
+#endif
+
diff --git a/pyconfig.h.in b/pyconfig.h.in
index 255a9839419..662955f5bc8 100644
--- a/pyconfig.h.in
+++ b/pyconfig.h.in
@@ -722,3 +722,11 @@
 #define DL_EXPORT(RTYPE) __declspec(dllexport) RTYPE
 #endif
 #endif
+
+/* Define the macros needed if on a UnixWare 7.x system. */
+#if defined(__USLC__) && defined(__SCO_VERSION__)
+#define SCO_ACCEPT_BUG     /* Use workaround for UnixWare accept() bug */
+#define SCO_ATAN2_BUG      /* Use workaround for UnixWare atan2() bug */
+#define STRICT_SYSV_CURSES /* Don't use ncurses extensions */
+#endif
+