diff -Nru pikepdf-1.17.3+dfsg/debian/changelog pikepdf-1.17.3+dfsg/debian/changelog
--- pikepdf-1.17.3+dfsg/debian/changelog	2020-07-26 22:47:36.000000000 +0000
+++ pikepdf-1.17.3+dfsg/debian/changelog	2020-12-09 10:35:14.000000000 +0000
@@ -1,3 +1,10 @@
+pikepdf (1.17.3+dfsg-1+rpi1) bullseye-staging; urgency=medium
+
+  [Changes taken from 1.17.3+dfsg-1ubuntu1 by Matthias Klose]
+  * Fix compatibility with pybind11. Closes: #975202.
+
+ -- Matthias Klose <doko@ubuntu.com>  Wed, 09 Dec 2020 11:35:14 +0100
+
 pikepdf (1.17.3+dfsg-1) unstable; urgency=medium
 
   * New upstream release.
diff -Nru pikepdf-1.17.3+dfsg/debian/patches/5394b7855eb87f637316432b2b597294adcb974e.diff pikepdf-1.17.3+dfsg/debian/patches/5394b7855eb87f637316432b2b597294adcb974e.diff
--- pikepdf-1.17.3+dfsg/debian/patches/5394b7855eb87f637316432b2b597294adcb974e.diff	1970-01-01 00:00:00.000000000 +0000
+++ pikepdf-1.17.3+dfsg/debian/patches/5394b7855eb87f637316432b2b597294adcb974e.diff	2020-12-09 10:35:14.000000000 +0000
@@ -0,0 +1,72 @@
+diff --git a/src/qpdf/pipeline.cpp b/src/qpdf/pipeline.cpp
+index 1856987..8a4fe79 100644
+--- a/src/qpdf/pipeline.cpp
++++ b/src/qpdf/pipeline.cpp
+@@ -22,6 +22,7 @@
+ 
+ #include "pikepdf.h"
+ #include "pipeline.h"
++#include "utils.h"
+ 
+ 
+ void Pl_PythonOutput::write(unsigned char *buf, size_t len)
+@@ -29,8 +30,7 @@ void Pl_PythonOutput::write(unsigned char *buf, size_t len)
+     py::gil_scoped_acquire gil;
+     ssize_t so_far = 0;
+     while (len > 0) {
+-        py::buffer_info buffer(buf, len);
+-        py::memoryview view_buffer(buffer);
++        py::memoryview view_buffer = memoryview_from_memory(buf, len);
+         py::object result = this->stream.attr("write")(view_buffer);
+         try {
+             so_far = result.cast<ssize_t>();
+diff --git a/src/qpdf/qpdf_inputsource.h b/src/qpdf/qpdf_inputsource.h
+index 4a96f6b..8ec6a55 100644
+--- a/src/qpdf/qpdf_inputsource.h
++++ b/src/qpdf/qpdf_inputsource.h
+@@ -82,8 +82,7 @@ class PythonStreamInputSource : public InputSource
+     {
+         py::gil_scoped_acquire gil;
+ 
+-        py::buffer_info buffer_info(buffer, length);
+-        py::memoryview view_buffer_info(buffer_info);
++        py::memoryview view_buffer_info = memoryview_from_memory(buffer, length);
+ 
+         this->last_offset = this->tell();
+         py::object result = this->stream.attr("readinto")(view_buffer_info);
+diff --git a/src/qpdf/utils.cpp b/src/qpdf/utils.cpp
+index bf189f6..36769ca 100644
+--- a/src/qpdf/utils.cpp
++++ b/src/qpdf/utils.cpp
+@@ -46,3 +46,20 @@
+     }
+ 
+ #endif
++
++// Copied from pybind11 master branch (pre-2.6), can remove when we require
++// pybind11 v2.6 and replace with py::memoryview::from_memory
++py::memoryview memoryview_from_memory(void *mem, ssize_t size, bool readonly)
++{
++    PyObject* ptr = PyMemoryView_FromMemory(
++        reinterpret_cast<char*>(mem), size,
++        (readonly) ? PyBUF_READ : PyBUF_WRITE);
++    if (!ptr)
++        py::pybind11_fail("Could not allocate memoryview object!");
++    return py::reinterpret_steal<py::memoryview>(ptr);
++}
++
++py::memoryview memoryview_from_memory(const void *mem, ssize_t size)
++{
++    return memoryview_from_memory(const_cast<void*>(mem), size, true);
++}
+diff --git a/src/qpdf/utils.h b/src/qpdf/utils.h
+index 9f6a411..f26c5bd 100644
+--- a/src/qpdf/utils.h
++++ b/src/qpdf/utils.h
+@@ -17,3 +17,6 @@ inline bool str_startswith(T haystack, S needle)
+ {
+     return std::string(haystack).rfind(needle, 0) == 0;
+ }
++
++py::memoryview memoryview_from_memory(void *mem, ssize_t size, bool readonly = false);
++py::memoryview memoryview_from_memory(const void *mem, ssize_t size);
diff -Nru pikepdf-1.17.3+dfsg/debian/patches/series pikepdf-1.17.3+dfsg/debian/patches/series
--- pikepdf-1.17.3+dfsg/debian/patches/series	2020-07-26 22:47:36.000000000 +0000
+++ pikepdf-1.17.3+dfsg/debian/patches/series	2020-12-09 10:35:14.000000000 +0000
@@ -2,3 +2,4 @@
 drop-installation-from-docs-contents.patch
 drop-pybind11-from-setup.py.patch
 drop-save-pike.patch
+5394b7855eb87f637316432b2b597294adcb974e.diff