diff --git a/src/s/bsd386.h b/src/s/bsd386.h
new file mode 100644
index 00000000000..292bcaf6d91
--- /dev/null
+++ b/src/s/bsd386.h
@@ -0,0 +1,15 @@
+/* s/ file for bsd386 system.  */
+
+#include "bsd4-3.h"
+
+#define SIGNALS_VIA_CHARACTERS
+
+#define PENDING_OUTPUT_COUNT(FILE) ((FILE)->_p - (FILE)->_bf._base)
+#define A_TEXT_OFFSET(x)    (sizeof (struct exec))
+#define A_TEXT_SEEK(hdr) (N_TXTOFF(hdr) + A_TEXT_OFFSET(hdr))
+
+#define HAVE_SETSID
+
+#define LIBS_DEBUG
+#define LIB_X11_LIB -L/usr/X11/lib -lX11
+#define LIBS_SYSTEM -lutil -lkvm -lcompat