diff --git a/Makefile b/Makefile
index 8ac2eb6..36296a7 100644
--- a/Makefile
+++ b/Makefile
@@ -1,52 +1,62 @@
-all: app web
-app: fonts icons
-	flutter build apk
+FLUTTER=flutter
 BASEHREF=/demo/
-web: fonts icons
-	flutter build web --base-href=$(BASEHREF) --release
+
+all: app web
+app: assets-android
+	$(FLUTTER) config --no-analytics
+	$(FLUTTER) build apk
+web: assets-web
+	$(FLUTTER) build web --base-href=$(BASEHREF) --release
 	rm -rf website/demo/
 	cp -p -r build/web/ website/demo/
 gh-pages:
-	flutter clean
-	make BASEHREF=/everest/demo/ web
+	$(FLUTTER) clean
+	$(MAKE) BASEHREF=/everest/demo/ web
 	# assumes worktree gh-pages is checked out in ./gh-pages/
 	cd gh-pages && git rm -rf . --ignore-unmatch && cp -p -r ../website/* . && git add . && git commit --amend --no-edit
 host:
 	cd website && python -m http.server 8000
-run: fonts icons
-	flutter run
+run: assets-android assets-web
+	$(FLUTTER) run
 test:
-	flutter test test/expressions_test.dart
+	$(FLUTTER) test test/expressions_test.dart
 clean: icons-clean
-	flutter clean
+	$(FLUTTER) clean
 	rm -rf website/demo/
 
-icons: android/app/src/main/res/mipmap-hdpi/ic_launcher.png website/favicon.ico web/favicon.ico web/icons/Icon-192.png web/icons/Icon-maskable-192.png web/icons/Icon-512.png web/icons/Icon-maskable-512.png
-android/app/src/main/res/mipmap-hdpi/ic_launcher.png: assets/launcher_icon.png
-	flutter pub get
-	flutter pub run flutter_launcher_icons:main
+assets-android: fonts icons-android
+assets-web: fonts icons-web
+
+# rasterized icons are generated from an svg file
+icons-android: android/app/src/main/res/mipmap-hdpi/ic_launcher.png
 assets/launcher_icon.png: assets/launcher_icon.svg
-	inkscape -w 1024 -h 1024 assets/launcher_icon.svg -o assets/launcher_icon.png
+	rsvg-convert --width=1024 --height=1024 --keep-aspect-ratio assets/launcher_icon.svg > $@
+android/app/src/main/res/mipmap-hdpi/ic_launcher.png: assets/launcher_icon.png
+	$(FLUTTER) pub get
+	$(FLUTTER) pub run flutter_launcher_icons:main
+
+icons-web: website/favicon.ico web/favicon.ico web/icons/Icon-192.png web/icons/Icon-maskable-192.png web/icons/Icon-512.png web/icons/Icon-maskable-512.png
 web/favicon.ico website/favicon.ico: assets/launcher_icon.svg
 	magick -background none assets/launcher_icon.svg -define icon:auto-resize $@
 web/icons/Icon-192.png web/icons/Icon-maskable-192.png: assets/launcher_icon.svg
 	mkdir -p web/icons/
-	inkscape -w 192 -h 192 assets/launcher_icon.svg -o $@
+	rsvg-convert --width=192 --height=192 --keep-aspect-ratio assets/launcher_icon.svg > $@
 web/icons/Icon-512.png web/icons/Icon-maskable-512.png: assets/launcher_icon.svg
 	mkdir -p web/icons/
-	inkscape -w 512 -h 512 assets/launcher_icon.svg -o $@
+	rsvg-convert --width=512 --height=512 --keep-aspect-ratio assets/launcher_icon.svg > $@
 icons-clean:
 	rm -f android/app/src/main/res/mipmap-*/ic_launcher.png
 	rm -f website/favicon.ico web/favicon.ico web/icons/*.png
 	rm -f assets/launcher_icon.png
 
+# fonts are downloaded and bundled into the app
 fonts: fonts/NotoSansMath-Regular.ttf
 fonts/NotoSansMath-Regular.ttf: | build/upstream/Noto_Sans_Math.zip
 	mkdir -p fonts/
 	unzip -o build/upstream/Noto_Sans_Math.zip -d fonts/
 build/upstream/Noto_Sans_Math.zip:
 	mkdir -p build/upstream/
-	wget -O build/upstream/Noto_Sans_Math.zip https://fonts.google.com/download?family=Noto%20Sans%20Math
+	curl --output build/upstream/Noto_Sans_Math.zip https://fonts.google.com/download?family=Noto%20Sans%20Math
 .INTERMEDIATE: build/upstream/Noto_Sans_Math.zip
 
-.PHONY: all app web gh-pages host run test zip fonts icons icons-clean clean
+.PHONY: all app web gh-pages host run test assets-android assets-web fonts icons-android icons-web icons-clean clean
diff --git a/README.md b/README.md
index a609361..2ccf779 100644
--- a/README.md
+++ b/README.md
@@ -4,4 +4,4 @@ A mathematical puzzle game. Try it at https://mwageringel.github.io/everest/
 
 ## Build dependencies
 
-Building with `make` requires `flutter, python, inkscape, imagemagick`.
+Building with `make` requires `flutter, curl, rsvg-convert, imagemagick`.