diff --git a/Makefile b/Makefile
index 21cf3e2..ecb72d1 100644
--- a/Makefile
+++ b/Makefile
@@ -5,16 +5,19 @@ SYSCONFDIR ?= /etc
 BINDIR     ?= $(PREFIX)/bin
 DATADIR    ?= $(PREFIX)/share
 LIBEXECDIR ?= $(PREFIX)/libexec
+BACKGROUND ?= $(DATADIR)/backgrounds/default.png
 
 .PHONY: build clean install check requires
 .DEFAULT: build
 
-GENERATED := $(patsubst %.in,%,$(wildcard sway/*.in sway/*/*.in ))
-VARIABLES := PREFIX SYSCONFDIR DATADIR LIBEXECDIR
+TEMPLATES := sway/*.in sway/*/*.in swaylock/*.in sddm/03-sway-fedora/theme.conf.in
+GENERATED := $(patsubst %.in,%,$(wildcard $(TEMPLATES)))
+VARIABLES := PREFIX SYSCONFDIR DATADIR LIBEXECDIR BACKGROUND
 
-sway/%: sway/%.in
-	sed "$(foreach var,$(VARIABLES),s^@$(var)@^$($(var))^i;)" $^ > $@
-	sed '$(foreach var,$(VARIABLES),s^$$$(var)\b^$($(var))^i;)' $^ > $@
+%: %.in
+	sed -e "$(foreach var,$(VARIABLES),s^@$(var)@^$($(var))^i;)"   \
+	    -e '$(foreach var,$(VARIABLES),s^$$$(var)\b^$($(var))^i;)' \
+	    $^ > $@
 
 build: $(GENERATED)
 
diff --git a/sddm/03-sway-fedora/theme.conf b/sddm/03-sway-fedora/theme.conf
deleted file mode 100644
index 80ad085..0000000
--- a/sddm/03-sway-fedora/theme.conf
+++ /dev/null
@@ -1,2 +0,0 @@
-[General]
-background=/usr/share/backgrounds/default.png
diff --git a/sddm/03-sway-fedora/theme.conf.in b/sddm/03-sway-fedora/theme.conf.in
new file mode 100644
index 0000000..757799e
--- /dev/null
+++ b/sddm/03-sway-fedora/theme.conf.in
@@ -0,0 +1,2 @@
+[General]
+background=@BACKGROUND@
diff --git a/sway-config-fedora.spec.rpkg b/sway-config-fedora.spec.rpkg
index 208bbd7..35f5ce8 100644
--- a/sway-config-fedora.spec.rpkg
+++ b/sway-config-fedora.spec.rpkg
@@ -2,6 +2,7 @@
 %bcond  initialsetup %[0%{?fedora} >= 40 || 0%{?rhel} >= 10]
 %bcond  sddm 1
 %global sway_ver 1.8
+%global bg_format %[ 0%{?fedora} >= 42 ? "jxl" : "png" ]
 
 Name:           {{{ git_name }}}
 Version:        {{{ git_version }}}
@@ -44,6 +45,9 @@ Requires: /usr/bin/pkill
 Requires: brightnessctl >= 0.5.1-11
 Requires: desktop-backgrounds-compat
 Requires: grimshot
+%if "%{bg_format}" == "jxl"
+Requires: jxl-pixbuf-loader
+%endif
 Requires: lxqt-policykit
 Requires: playerctl
 Requires: pulseaudio-utils
@@ -80,6 +84,9 @@ Provides:       sddm-greeter-displayserver
 Conflicts:      sddm-greeter-displayserver
 
 Requires:       desktop-backgrounds-compat
+%if "%{bg_format}" == "jxl"
+Requires:       kf6-kimageformats
+%endif
 Requires:       sddm >= 0.20.0
 Requires:       sway >= %{sway_ver}
 
@@ -94,11 +101,16 @@ to use Sway for the greeter display server.
 
 
 %build
-%make_build
+%make_build \
+    PREFIX='%{_prefix}' \
+    BACKGROUND='%{_datadir}/backgrounds/default.%{bg_format}'
 
 
 %install
-%make_install PREFIX='%{_prefix}' WITH_INITIALSETUP='%[%{with initialsetup}?"yes":"no"]' WITH_SDDM='%[%{with sddm}?"yes":"no"]'
+%make_install \
+    PREFIX='%{_prefix}' \
+    WITH_INITIALSETUP='%[%{with initialsetup}?"yes":"no"]' \
+    WITH_SDDM='%[%{with sddm}?"yes":"no"]'
 
 
 %files
diff --git a/sway/config.in b/sway/config.in
index 6e57ce5..53b8844 100644
--- a/sway/config.in
+++ b/sway/config.in
@@ -30,8 +30,8 @@ set $menu $rofi_cmd -show combi -combi-modes drun#run -modes combi
 ### Output configuration
 #
 # Default wallpaper (more resolutions are available in /usr/share/backgrounds/sway/)
-# Requires: desktop-backgrounds-compat, swaybg
-output * bg /usr/share/backgrounds/default.png fill
+# Requires: desktop-backgrounds-compat, swaybg, jxl-pixbuf-loader
+output * bg @BACKGROUND@ fill
 #
 # Example configuration:
 #
diff --git a/swaylock/config b/swaylock/config.in
similarity index 84%
rename from swaylock/config
rename to swaylock/config.in
index ec2afc7..607bcf2 100644
--- a/swaylock/config
+++ b/swaylock/config.in
@@ -3,5 +3,5 @@
 #
 # Image path supports environment variables and shell expansions,
 # e.g. image=$HOME/Pictures/default.png
-image=/usr/share/backgrounds/default.png
+image=@BACKGROUND@
 scaling=fill