diff --git a/gcc/config/i386/x-isc b/gcc/config/i386/x-isc
new file mode 100644
index 00000000000..db2f1656e19
--- /dev/null
+++ b/gcc/config/i386/x-isc
@@ -0,0 +1,4 @@
+CLIB = -lPW -lcposix
+INSTALL = cp
+X_CFLAGS = -D_POSIX_SOURCE
+ENQUIRE_LDFLAGS = -posix $(LDFLAGS)