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diff --git a/hints/irix_4.sh b/hints/irix_4.sh
index a5d08e0..5c5bdb2 100644
--- a/hints/irix_4.sh
+++ b/hints/irix_4.sh
@@ -17,8 +17,29 @@ esac
 # I don't know if they affect versions of perl other than 5.000 or
 # versions of IRIX other than 4.0.4.
 #
-cat <<'EOM'
+cat <<'EOM' >&4
 If you have problems, you might have try including
 	-DSTANDARD_C -cckr 
 in ccflags.
 EOM
+
+case "$usethreads" in
+$define|true|[yY]*)
+        cat >&4 <<EOM
+IRIX `uname -r` does not support POSIX threads.
+You should upgrade to at least IRIX 6.2 with pthread patches.
+EOM
+	exit 1
+	;;
+esac
+
+case " $use64bits $use64bitint $use64bitall " in
+*" $define "*|*" true "*|*" [yY] "*)
+	cat >&4 <<EOM
+IRIX `uname -r` does not support 64-bit types.
+You should upgrade to at least IRIX 6.2.
+Cannot continue, aborting.
+EOM
+	exit 1
+esac
+