Rename Setup.in to Setup.dist, and assume that configure will create
Setup (instead of creating it from the Makefile).
diff --git a/Modules/makesetup b/Modules/makesetup
index 0a2794e..09ab50c 100755
--- a/Modules/makesetup
+++ b/Modules/makesetup
@@ -16,7 +16,7 @@
# Setup files after a -n option are used for their variables, modules
# and libraries but not for their .o files.
#
-# See Setup.in for a description of the format of the Setup file.
+# See Setup.dist for a description of the format of the Setup file.
#
# The following edits are made:
#