Dear maintainer, I've prepared an NMU for jansson (versioned as 2.13.1-1.1). The diff is attached to this message.
Cheers -- Sebastian Ramacher
diff -Nru jansson-2.13.1/debian/changelog jansson-2.13.1/debian/changelog
--- jansson-2.13.1/debian/changelog 2020-06-28 14:46:50.000000000 +0200
+++ jansson-2.13.1/debian/changelog 2021-02-04 22:47:01.000000000 +0100
@@ -1,3 +1,14 @@
+jansson (2.13.1-1.1) unstable; urgency=medium
+
+ * Non-maintainer upload
+
+ [ Sebastien Bacher ]
+ * debian/patches/git_new_sphinx.patch:
+ - backport an upstream change to fix the build with sphinx3
+ (Closes: #963640)
+
+ -- Sebastian Ramacher <sramac...@debian.org> Thu, 04 Feb 2021 22:47:01 +0100
+
jansson (2.13.1-1) unstable; urgency=medium
* New upstream release (Closes: #963842)
diff -Nru jansson-2.13.1/debian/patches/git_new_sphinx.patch jansson-2.13.1/debian/patches/git_new_sphinx.patch
--- jansson-2.13.1/debian/patches/git_new_sphinx.patch 1970-01-01 01:00:00.000000000 +0100
+++ jansson-2.13.1/debian/patches/git_new_sphinx.patch 2021-02-04 22:45:41.000000000 +0100
@@ -0,0 +1,66 @@
+From 798d40c3f3e0700501de1588274b69e2b128ad7c Mon Sep 17 00:00:00 2001
+From: Pierce Lopez <pierce.lo...@gmail.com>
+Date: Fri, 7 Aug 2020 01:54:45 -0400
+Subject: [PATCH] doc: convert refcounting directive to a class
+
+Directive functions are no longer supported in Sphinx-3.0
+but directive classes have been supported since early 1.x
+---
+ doc/ext/refcounting.py | 31 ++++++++++++++++++++-----------
+ 1 file changed, 20 insertions(+), 11 deletions(-)
+
+diff --git a/doc/ext/refcounting.py b/doc/ext/refcounting.py
+index bba26849..e72c481c 100644
+--- a/doc/ext/refcounting.py
++++ b/doc/ext/refcounting.py
+@@ -24,8 +24,8 @@
+ """
+
+ from docutils import nodes
++from docutils.parsers.rst import Directive
+
+-class refcounting(nodes.emphasis): pass
+
+ def visit(self, node):
+ self.visit_emphasis(node)
+@@ -40,16 +40,25 @@ def html_depart(self, node):
+ self.body.append('</em>')
+
+
+-def refcounting_directive(name, arguments, options, content, lineno,
+- content_offset, block_text, state, state_machine):
+- if arguments[0] == 'borrow':
+- text = 'Return value: Borrowed reference.'
+- elif arguments[0] == 'new':
+- text = 'Return value: New reference.'
+- else:
+- raise Error('Valid arguments: new, borrow')
++class refcounting(nodes.emphasis):
++ pass
++
++class refcounting_directive(Directive):
++ has_content = False
++ required_arguments = 1
++ optional_arguments = 0
++ final_argument_whitespace = False
++
++ def run(self):
++ if self.arguments[0] == 'borrow':
++ text = 'Return value: Borrowed reference.'
++ elif self.arguments[0] == 'new':
++ text = 'Return value: New reference.'
++ else:
++ raise Error('Valid arguments: new, borrow')
++
++ return [refcounting(text, text)]
+
+- return [refcounting(text, text)]
+
+ def setup(app):
+ app.add_node(refcounting,
+@@ -57,4 +66,4 @@ def setup(app):
+ latex=(visit, depart),
+ text=(visit, depart),
+ man=(visit, depart))
+- app.add_directive('refcounting', refcounting_directive, 0, (1, 0, 0))
++ app.add_directive('refcounting', refcounting_directive)
diff -Nru jansson-2.13.1/debian/patches/series jansson-2.13.1/debian/patches/series
--- jansson-2.13.1/debian/patches/series 1970-01-01 01:00:00.000000000 +0100
+++ jansson-2.13.1/debian/patches/series 2021-02-04 22:45:41.000000000 +0100
@@ -0,0 +1 @@
+git_new_sphinx.patch
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