diff --git a/moo/lib/exec.c b/moo/lib/exec.c
index e545de2..542cd71 100644
--- a/moo/lib/exec.c
+++ b/moo/lib/exec.c
@@ -119,6 +119,8 @@ static MOO_INLINE const char* proc_state_to_string (int state)
 #if defined(__DOS__) && (defined(_INTELC32_) || (defined(__WATCOMC__) && (__WATCOMC__ <= 1000)))
 	/* the old intel c code builder doesn't support __FUNCTION__ */
 #	define __PRIMITIVE_NAME__ "<<primitive>>"
+#elif defined(_SCO_DS)
+#	define __PRIMITIVE_NAME__ "<<primitive>>"
 #else
 #	define __PRIMITIVE_NAME__ (&__FUNCTION__[0])
 #endif
diff --git a/moo/mod/_sck.h b/moo/mod/_sck.h
index f2c4aab..9c4c735 100644
--- a/moo/mod/_sck.h
+++ b/moo/mod/_sck.h
@@ -71,7 +71,9 @@ struct sck_t
 		typedef moo_uint64_t sck_len_t;
 	#endif
 #else
-#	error UNSUPPORT sck_len_t size
+#	define MOO_SIZEOF_SOCKLEN_T MOO_SIZEOF_INT
+#	define MOO_SOCKLEN_T_IS_SIGNED
+	typedef int sck_len_t;
 #endif
 
 #if (MOO_SIZEOF_SA_FAMILY_T == 1)
@@ -99,7 +101,9 @@ struct sck_t
 		typedef moo_uint64_t sck_addr_family_t;
 	#endif
 #else
-#	error UNSUPPORT sck_addr_family_t size
+#	define MOO_SIZEOF_SA_FAMILY_T MOO_SIZEOF_INT
+#	define MOO_SA_FAMILY_T_IS_SIGNED
+	typedef int sck_addr_family_t;
 #endif
 
 struct sck_addr_t