diff -Nru spdlog-1.5.0+ds/debian/changelog spdlog-1.5.0+ds/debian/changelog
--- spdlog-1.5.0+ds/debian/changelog	2020-03-03 10:44:57.000000000 +0000
+++ spdlog-1.5.0+ds/debian/changelog	2020-03-05 19:56:41.000000000 +0000
@@ -1,3 +1,13 @@
+spdlog (1:1.5.0+ds-3+rpi1) bullseye-staging; urgency=medium
+
+  [changes brought forward from 1:1.1.0-2+rpi1 by Peter Michael Green <plugwash@raspbian.org> at Wed, 10 Oct 2018 00:49:48 +0000]
+  * use libatomic on armhf too for raspbian.
+
+  [changes introduced in 1:1.5.0-1+rpi1 by Peter Michael Green]
+  * Add symbols file hack for Raspbian.
+
+ -- Raspbian forward porter <root@raspbian.org>  Thu, 05 Mar 2020 19:56:41 +0000
+
 spdlog (1:1.5.0+ds-3) unstable; urgency=medium
 
   * Speed up nocheck build profile by not building the tests & example
diff -Nru spdlog-1.5.0+ds/debian/rules spdlog-1.5.0+ds/debian/rules
--- spdlog-1.5.0+ds/debian/rules	2020-03-03 10:44:57.000000000 +0000
+++ spdlog-1.5.0+ds/debian/rules	2020-03-05 19:56:41.000000000 +0000
@@ -1,7 +1,7 @@
 #!/usr/bin/make -f
 
 #export DH_VERBOSE=1
-ifneq (,$(filter $(DEB_HOST_ARCH), armel m68k mips mipsel powerpc powerpcspe sh4))
+ifneq (,$(filter $(DEB_HOST_ARCH), armhf armel m68k mips mipsel powerpc powerpcspe sh4))
   export DEB_LDFLAGS_MAINT_APPEND=-latomic
 endif
 
@@ -15,6 +15,7 @@
 #	dh_auto_configure -- -Denable_tests=true -Dexternal_fmt=true -Dlibrary_type=shared
 
 override_dh_auto_configure:
+	sed -i 's/(arch=!armel !riscv64)/(optional=meh)/' debian/libspdlog*.symbols
 	rm -Rf include/spdlog/fmt/bundled/
 ifeq (,$(filter nocheck,$(DEB_BUILD_OPTIONS) $(DEB_BUILD_PROFILES)))
 	dh_auto_configure -- -DSPDLOG_BUILD_EXAMPLE=ON \
@@ -41,3 +42,7 @@
 	rm -f example/logs/.gitignore
 	dh_auto_install
 	find debian -name .gitignore -delete
+
+override_dh_auto_clean:
+	dh_auto_clean
+	sed -i 's/(optional=meh)/(arch=!armel !riscv64)/' debian/libspdlog*.symbols