diff --git a/gcc/config/i386/xm-dos.h b/gcc/config/i386/xm-dos.h
new file mode 100644
index 00000000000..9d989e89d0d
--- /dev/null
+++ b/gcc/config/i386/xm-dos.h
@@ -0,0 +1,4 @@
+#include "xm-i386.h"
+
+/* Inhibit cccp.c's definition of putenv.  */
+#define HAVE_PUTENV