diff --git a/gcc/config/i386/x-isc3 b/gcc/config/i386/x-isc3
new file mode 100644
index 00000000000..48c7874844f
--- /dev/null
+++ b/gcc/config/i386/x-isc3
@@ -0,0 +1,3 @@
+CLIB = -lPW
+X_CFLAGS = -D_SYSV3 -DPOSIX_JC
+ENQUIRE_LDFLAGS = $(LDFLAGS)