diff -Nru ceres-solver-1.14.0/debian/changelog ceres-solver-1.14.0/debian/changelog
--- ceres-solver-1.14.0/debian/changelog	2020-06-08 18:47:40.000000000 +0000
+++ ceres-solver-1.14.0/debian/changelog	2020-09-22 14:16:18.000000000 +0000
@@ -1,3 +1,10 @@
+ceres-solver (1.14.0-8+rpi1) bullseye-staging; urgency=medium
+
+  * Build with gcc-9 due to symbol definition loop error with gcc-10.
+  * Add -f to rm command that is failing on nonexistent file.
+
+ -- Peter Michael Green <plugwash@raspbian.org>  Tue, 22 Sep 2020 14:16:18 +0000
+
 ceres-solver (1.14.0-8) unstable; urgency=medium
 
   * Team upload.
diff -Nru ceres-solver-1.14.0/debian/control ceres-solver-1.14.0/debian/control
--- ceres-solver-1.14.0/debian/control	2020-06-08 18:02:55.000000000 +0000
+++ ceres-solver-1.14.0/debian/control	2020-09-22 14:16:18.000000000 +0000
@@ -16,7 +16,9 @@
                libjs-jquery,
                libjs-mathjax,
                libjs-modernizr,
-               libjs-underscore
+               libjs-underscore,
+               gcc-9,
+               g++-9
 Standards-Version: 4.3.0
 Vcs-Browser: https://salsa.debian.org/science-team/ceres-solver
 Vcs-Git: https://salsa.debian.org/science-team/ceres-solver.git
diff -Nru ceres-solver-1.14.0/debian/rules ceres-solver-1.14.0/debian/rules
--- ceres-solver-1.14.0/debian/rules	2020-06-08 18:02:10.000000000 +0000
+++ ceres-solver-1.14.0/debian/rules	2020-09-22 14:16:18.000000000 +0000
@@ -2,6 +2,10 @@
 export DH_VERBOSE=1
 
 export DEB_BUILD_MAINT_OPTIONS = hardening=+all
+
+export CC=gcc-9
+export CXX=g++-9
+
 include /usr/share/dpkg/default.mk
 
 build: build-arch build-indep
@@ -62,7 +66,7 @@
 	sed -i 's/https:\/\/cdnjs.cloudflare.com\/ajax\/libs\/mathjax\/2.7.1/\/usr\/share\/javascript\/mathjax/g' $(CURDIR)/debian/tmp/usr/share/doc/ceres/html/*.html
 	rm debian/tmp/usr/share/doc/ceres/html/_static/jquery.js
 	ln -s /usr/share/javascript/jquery/jquery.js debian/tmp/usr/share/doc/ceres/html/_static/jquery.js
-	rm debian/tmp/usr/share/doc/ceres/html/_static/js/modernizr.min.js
+	rm -f debian/tmp/usr/share/doc/ceres/html/_static/js/modernizr.min.js
 	ln -s /usr/share/javascript/modernizr/modernizr.min.js debian/tmp/usr/share/doc/ceres/html/_static/js/modernizr.min.js
 	rm debian/tmp/usr/share/doc/ceres/html/_static/underscore.js
 	ln -s /usr/share/javascript/underscore/underscore.js debian/tmp/usr/share/doc/ceres/html/_static/underscore.js