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diff --git a/src/maker/tlv/sandpiper.vh b/src/maker/tlv/sandpiper.vh
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+/*
+Copyright (c) 2015, Steven F. Hoover
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright notice,
+      this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+    * The name of Steven F. Hoover
+      may not be used to endorse or promote products derived from this software
+      without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+// Project-independent SandPiper header file.
+
+`ifndef SANDPIPER_VH
+`define SANDPIPER_VH
+
+
+// Note, these have no SP prefix, so collisions are possible.
+     
+
+`ifdef WHEN
+   // Make sure user definition does not collide.
+   !!!ERROR: WHEN macro already defined
+`else
+   `ifdef SP_PHYS
+      // Phys compilation disabled X-injection.
+      `define WHEN(valid_sig)
+   `else
+      // Inject X.
+      `define WHEN(valid_sig) !valid_sig ? 'x :
+   `endif
+`endif
+
+
+// SandPiper does not generate set/reset flops.  Reset is implemented as combinational
+// logic, and it is up to synthesis to infer set/reset flops when possible.
+//`ifdef RESET
+//   // Make sure user definition does not collide.
+//   !!!ERROR: RESET macro already defined
+//`else
+//   `define RESET(i, reset) ((reset) ? '0 : i)
+//`endif
+//
+//`ifdef SET
+//   // Make sure user definition does not collide.
+//   !!!ERROR: SET macro already defined
+//`else
+//   `define SET(i, set) ((set) ? '1 : i)
+//`endif
+
+// Since SandPiper required use of all signals, this is useful to create a
+// bogus use and keep SandPiper happy when a signal, by intent, has no uses.
+`define BOGUS_USE(ignore)
+
+`endif  // SANDPIPER_VH
+