forgot this

src/cmd/page/pdfprolog.ps

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+/Page null def
+/Page# 0 def
+/PDFSave null def
+/DSCPageCount 0 def
+/DoPDFPage {dup /Page# exch store pdfgetpage mypdfshowpage } def
+
+/pdfshowpage_mysetpage {	% <pagedict> pdfshowpage_mysetpage <pagedict>
+  dup /CropBox pget {
+      boxrect
+      2 array astore /PageSize exch 4 2 roll
+      neg exch neg exch 2 array astore /PageOffset exch
+      << 5 1 roll >> setpagedevice
+  } if
+} bind def
+
+/mypdfshowpage		% <pagedict> pdfshowpage -
+ { dup /Page exch store
+   pdfshowpage_init 
+   pdfshowpage_setpage 
+   pdfshowpage_mysetpage
+   save /PDFSave exch store
+   (before exec) VMDEBUG
+     pdfshowpage_finish
+   (after exec) VMDEBUG
+   PDFSave restore
+ } bind def
+
+GS_PDF_ProcSet begin
+pdfdict begin