has_clip is not cleared in _cairo_pdf_document_add_page after writing out
the Q command, causing a mild panic in Acroread when opening the next page.

The following patch cures this for me (i do not know the innards of cairo,
so this might leak memory as hell):

--- cairo-1.0.2/src/cairo-pdf-surface.c 2005-08-20 00:05:14.000000000 +0300
+++ cairo-1.0.2-work/src/cairo-pdf-surface.c    2005-12-30 21:55:44.000000000 +0200
@@ -1758,8 +1758,10 @@

     _cairo_pdf_surface_ensure_stream (surface);

-    if (surface->has_clip)
+    if (surface->has_clip) {
        _cairo_output_stream_printf (output, "Q\r\n");
+       surface->has_clip=FALSE;
+    }

     _cairo_pdf_document_close_stream (document);