diff -Nru mandelbulber2-2.20/debian/changelog mandelbulber2-2.20/debian/changelog
--- mandelbulber2-2.20/debian/changelog	2020-03-22 15:49:16.000000000 +0000
+++ mandelbulber2-2.20/debian/changelog	2020-06-03 05:50:25.000000000 +0000
@@ -1,8 +1,9 @@
-mandelbulber2 (2.20-1build1) focal; urgency=medium
+mandelbulber2 (2.20-2) unstable; urgency=medium
 
-  * No-change rebuild for libgcc-s1 package name change.
+  * Fix FTBFS by disabling documentation watermark that does not compile
+    anymore with current LaTeX (closes: #959583).
 
- -- Matthias Klose <doko@ubuntu.com>  Sun, 22 Mar 2020 16:49:16 +0100
+ -- Giovanni Mascellani <gio@debian.org>  Wed, 03 Jun 2020 07:50:25 +0200
 
 mandelbulber2 (2.20-1) unstable; urgency=medium
 
diff -Nru mandelbulber2-2.20/debian/patches/0003-Remove-watermark-that-does-not-compile-anymore.patch mandelbulber2-2.20/debian/patches/0003-Remove-watermark-that-does-not-compile-anymore.patch
--- mandelbulber2-2.20/debian/patches/0003-Remove-watermark-that-does-not-compile-anymore.patch	1970-01-01 00:00:00.000000000 +0000
+++ mandelbulber2-2.20/debian/patches/0003-Remove-watermark-that-does-not-compile-anymore.patch	2020-06-03 05:50:25.000000000 +0000
@@ -0,0 +1,35 @@
+From: Giovanni Mascellani <gio@debian.org>
+Date: Tue, 2 Jun 2020 11:54:46 +0200
+Subject: Remove watermark that does not compile anymore.
+
+---
+ docs/mandelbulber2/preamble.tex | 10 +++++-----
+ 1 file changed, 5 insertions(+), 5 deletions(-)
+
+diff --git a/docs/mandelbulber2/preamble.tex b/docs/mandelbulber2/preamble.tex
+index 3e6f4b8..072951d 100644
+--- a/docs/mandelbulber2/preamble.tex
++++ b/docs/mandelbulber2/preamble.tex
+@@ -20,17 +20,17 @@
+ \usepackage{float}
+ \usepackage{tikz}
+ \usepackage[super]{nth}
+-\usepackage[firstpage]{draftwatermark}
++%\usepackage[firstpage]{draftwatermark}
+ \usepackage{supertabular}
+ \usepackage{booktabs}
+ \usepackage{lmodern}
+ 
+ \renewcommand{\familydefault}{\sfdefault}
+  
+-\SetWatermarkLightness{0.9}
+-\SetWatermarkText{\tikz\node[opacity=0.2]{
+-	\includegraphics[width=1.1\paperwidth,angle=-45]{img/mandelbulber_background.jpg}};
+-}
++%\SetWatermarkLightness{0.9}
++%\SetWatermarkText{\tikz\node[opacity=0.2]{
++%	\includegraphics[width=1.1\paperwidth,angle=-45]{img/mandelbulber_background.jpg}};
++%}
+ 
+ \usepackage[font={footnotesize,it}]{caption}
+ \let\counterwithout\relax
diff -Nru mandelbulber2-2.20/debian/patches/series mandelbulber2-2.20/debian/patches/series
--- mandelbulber2-2.20/debian/patches/series	2020-01-04 15:46:31.000000000 +0000
+++ mandelbulber2-2.20/debian/patches/series	2020-06-03 05:50:25.000000000 +0000
@@ -1,2 +1,3 @@
 manual-filename.patch
 fix-latex-chngcntr.patch
+0003-Remove-watermark-that-does-not-compile-anymore.patch