Forward Windows build instructions to PCbuild.
diff --git a/README b/README
index 03e4a1e..7cc85da 100644
--- a/README
+++ b/README
@@ -144,6 +144,8 @@
 normally on your PATH, you may want to set up a symlink in
 /usr/local/bin.
 
+On Windows, see PCbuild/readme.txt.
+
 If you wish, you can create a subdirectory and invoke configure from
 there.  For example: