diff --git a/msdos/sed2.inp b/msdos/sed2.inp
new file mode 100644
index 00000000000..67161ef9eed
--- /dev/null
+++ b/msdos/sed2.inp
@@ -0,0 +1,27 @@
+# ----------------------------------------------------------------------
+# Configuration script for config.h
+# ----------------------------------------------------------------------
+/^#undef LISP_FLOAT_TYPE *$/s/undef/define/
+/^#undef GNU_MALLOC *$/s/undef/define/
+/^#undef REL_ALLOC *$/s/undef/define/
+/^#undef HAVE_SYS_TIMEB_H *$/s/undef/define/
+/^#undef HAVE_SYS_TIME_H *$/s/undef/define/
+# /^#undef HAVE_UNISTD_H *$/s/undef/define/
+/^#undef HAVE_GETTIMEOFDAY *$/s/undef/define/
+/^#undef HAVE_GETHOSTNAME *$/s/undef/define/
+/^#undef HAVE_DUP2 *$/s/undef/define/
+/^#undef HAVE_TM_ZONE *$/s/undef/define/
+/^#undef TM_IN_SYS_TIME *$/s/undef/define/
+/^#undef TIME_WITH_SYS_TIME *$/s/undef/define/
+/^#undef HAVE_RENAME *$/s/undef/define/
+/^#undef HAVE_CLOSEDIR *$/s/undef/define/
+/^#undef HAVE_RANDOM *$/s/undef/define/
+/^#undef HAVE_MKDIR *$/s/undef/define/
+/^#undef HAVE_RMDIR *$/s/undef/define/
+/^#undef HAVE_BCOPY *$/s/undef/define/
+/^#undef HAVE_FREXP *$/s/undef/define/
+/^#undef HAVE_FTIME *$/s/undef/define/
+s/^#define USER_FULL_NAME .*$/#define USER_FULL_NAME (getenv ("NAME"))/
+s/^#undef STACK_DIRECTION *$/#define STACK_DIRECTION -1/
+s!^#undef config_opsysfile *$!#define config_opsysfile "s/msdos.h"!
+s!^#undef config_machfile *$!#define config_machfile "m/dos386.h"!