diff -Nru squid-4.6/debian/changelog squid-4.6/debian/changelog
--- squid-4.6/debian/changelog	2019-07-24 17:33:25.000000000 +0000
+++ squid-4.6/debian/changelog	2019-10-31 17:50:31.000000000 +0000
@@ -1,3 +1,10 @@
+squid (4.6-1+deb10u1+rpi1) bullseye-staging; urgency=medium
+
+  * Use --disable-strict-error-checking so build does not use -Werror
+    and prevent the build from failing with new gcc-9 warnings.
+
+ -- Peter Michael Green <plugwash@raspbian.org>  Thu, 31 Oct 2019 17:50:31 +0000
+
 squid (4.6-1+deb10u1) buster-security; urgency=high
 
   * Non-maintainer upload by the Security Team.
diff -Nru squid-4.6/debian/rules squid-4.6/debian/rules
--- squid-4.6/debian/rules	2019-07-24 17:33:25.000000000 +0000
+++ squid-4.6/debian/rules	2019-10-31 17:50:21.000000000 +0000
@@ -62,7 +62,8 @@
 		--with-filedescriptors=65536 \
 		--with-large-files \
 		--with-default-user=proxy \
-		--with-gnutls
+		--with-gnutls \
+		--disable-strict-error-checking
 
 ifeq ($(DEB_HOST_ARCH_OS), kfreebsd)
 		DEB_CONFIGURE_EXTRA_FLAGS += --enable-kqueue