diff --git a/debian/.gitattributes b/debian/.gitattributes
deleted file mode 100644
index 4e1c675..0000000
--- a/debian/.gitattributes
+++ /dev/null
@@ -1,3 +0,0 @@
-.gitattributes export-ignore
-gbp.conf export-ignore
-salsa-ci.yml
diff --git a/debian/changelog b/debian/changelog
index bc52aba..7529409 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,11 @@
+gnome-chemistry-utils (0.14.17-6.1) unstable; urgency=medium
+
+ * Non-maintainer upload.
+ * Build with -std=gnu++14 to workaround FTBFS with gcc 11.
+ (Closes: #984154)
+
+ -- Adrian Bunk <bunk@debian.org> Sat, 04 Dec 2021 16:51:53 +0200
+
gnome-chemistry-utils (0.14.17-6) unstable; urgency=medium
* d/patches/gchempaint-merge-molecules-fix.patch: Add patch.
diff --git a/debian/gbp.conf b/debian/gbp.conf
deleted file mode 100644
index d269cfd..0000000
--- a/debian/gbp.conf
+++ /dev/null
@@ -1,7 +0,0 @@
-[DEFAULT]
-pristine-tar = true
-debian-branch = debian/sid
-verbose = true
-
-[buildpackage]
-overlay = false
diff --git a/debian/rules b/debian/rules
index d855ef2..1bbb640 100755
--- a/debian/rules
+++ b/debian/rules
@@ -6,6 +6,7 @@
DEB_VENDOR := $(shell dpkg-vendor --query vendor)
export DEB_BUILD_MAINT_OPTIONS = hardening=+all
+export DEB_CXXFLAGS_MAINT_APPEND = -std=gnu++14
DPKG_EXPORT_BUILDFLAGS = 1
include /usr/share/dpkg/buildflags.mk
