diff --git a/.clang-format b/.clang-format
new file mode 100644
index 0000000..126882a
--- /dev/null
+++ b/.clang-format
@@ -0,0 +1,59 @@
+---
+Language: Cpp
+ColumnLimit: 140
+IndentWidth: 4
+PPIndentWidth: 2
+UseTab: Never
+
+AlignArrayOfStructures: Left
+
+IndentCaseBlocks: true
+IndentCaseLabels: true
+IndentGotoLabels: false
+IndentPPDirectives: AfterHash
+IndentWrappedFunctionNames: true
+
+InsertBraces: false
+InsertNewlineAtEOF: true
+
+MaxEmptyLinesToKeep: 1
+
+PointerAlignment: Left
+ReferenceAlignment: Left
+QualifierAlignment: Left
+
+SortIncludes: false
+
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeParens: ControlStatements
+SpaceBeforeRangeBasedForLoopColon: true
+SpaceInEmptyParentheses: false
+SpacesInAngles: true
+SpacesInCStyleCastParentheses: true
+SpacesInContainerLiterals: true
+SpacesInParentheses: true
+SpacesInSquareBrackets: true
+SpaceAfterCStyleCast: false
+SpaceAfterLogicalNot: false
+
+BreakBeforeBraces: Custom
+BraceWrapping:
+  AfterCaseLabel:  false
+  AfterClass:      false
+  AfterControlStatement: Never
+  AfterEnum:       false
+  AfterExternBlock: false
+  AfterFunction:   true
+  AfterNamespace:  false
+  AfterObjCDeclaration: false
+  AfterStruct:     false
+  AfterUnion:      false
+  BeforeCatch:     false
+  BeforeElse:      false
+  BeforeLambdaBody: false
+  BeforeWhile:     false
+  IndentBraces:    false
+  SplitEmptyFunction: true
+  SplitEmptyRecord: true
+  SplitEmptyNamespace: true
+...
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..14c9763
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,41 @@
+.PHONY: release release-with-assets debug debug-with-assets clean mrproper pull-emu48plus pull-assets keystore linux-compatible undo-linux-compatible
+
+release:
+	./gradlew assembleRelease assembleReleaseUnitTest
+	find . -name \*.apk
+
+debug:
+	./gradlew assembleDebug assembleDebugUnitTest
+	find . -name \*.apk
+
+clean:
+	./gradlew clean
+	-rm -fr ./app/src/main/cpp/emu48plus.bkp
+	-rm -fr ./app/src/main/assets/calculators.bkp
+
+mrproper: clean
+	-rm -fr ./app/src/main/assets/calculators/*
+
+linux-compatible:
+	zsh ./make-linux-compatible.sh
+
+undo-linux-compatible:
+	git reset --hard HEAD
+	rm -f app/src/main/cpp/core/emu48.c
+	rm -f app/src/main/cpp/core/emu48.h
+	rm -f app/src/main/cpp/core/opcodes.h
+
+keystore:
+	bash ./gen-keystore.sh
+
+# These are leftovers from a previous iteration,
+# neither necessary not up-to-date but ncie to keep around for reference
+release-with-assets: pull-assets release
+
+debug-with-assets: pull-assets debug
+
+pull-emu48plus:
+	zsh ./pull-emu48plus-sources.sh
+
+pull-assets:
+	bash ./pull-KMLs-and-ROMs.sh
diff --git a/gen-keystore.sh b/gen-keystore.sh
new file mode 100755
index 0000000..bc7d603
--- /dev/null
+++ b/gen-keystore.sh
@@ -0,0 +1,21 @@
+#!/bin/bash
+
+cd "$(dirname "$0")" || exit 1
+
+KEYSTORE_FILE=${KEYSTORE_FILE:-./keystore.jks}
+ALIAS=key-emu48
+
+echo "Generating $KEYSTORE_FILE…"
+keytool -genkey -keystore "$KEYSTORE_FILE" -keyalg RSA -validity 9125 -alias $ALIAS
+
+echo -n "Type again the password (will not echo): "
+read -s password
+echo
+
+echo "Generating ./keystore.properties…"
+cat <<EOF > ./keystore.properties
+storeFile=$KEYSTORE_FILE
+storePassword=$password
+keyAlias=$ALIAS
+keyPassword=$password
+EOF
diff --git a/local.properties.sample b/local.properties.sample
new file mode 100644
index 0000000..62dc5ca
--- /dev/null
+++ b/local.properties.sample
@@ -0,0 +1,8 @@
+## This file must *NOT* be checked into Version Control Systems,
+# as it contains information specific to your local configuration.
+#
+# Location of the SDK. This is only used by Gradle.
+# For customization when using a Version Control System, please read the
+# header note.
+#Mon Apr 01 18:38:15 CEST 2024
+sdk.dir=/home/gwh/Android/Sdk
diff --git a/make-linux-compatible.sh b/make-linux-compatible.sh
new file mode 100755
index 0000000..09b7842
--- /dev/null
+++ b/make-linux-compatible.sh
@@ -0,0 +1,68 @@
+#!/bin/zsh
+
+# This script depends on:
+#  - fd
+#  - sed
+#  - grep
+#  - dos2unix
+#  - clang-format
+
+set -eu
+
+cd "$(dirname "$0")" || exit 1
+CWD=$(pwd)
+
+cd ./app/src/main/cpp/core/ || exit 1
+
+echo "> Correct filenames' case"
+for f in ./*; do
+    dos2unix "$f" >/dev/null 2>&1
+
+    echo "$f" | grep -q "[A-Z]" && mv "$f" "$(echo "$f" | tr '[:upper:]' '[:lower:]')"
+done
+
+cd "$CWD" || exit 1
+
+echo "> fix includes for lowercase filenames"
+sed -i 's|Emu48\.h|emu48.h|g' $(grep -l "Emu48\.h[^t]" * -r)
+sed -i 's|Emu48Dll\.h|emu48dll.h|g' $(grep -l "Emu48Dll\.h" * -r)
+sed -i 's|Opcodes\.h|opcodes.h|g' $(grep -l "Opcodes\.h" * -r)
+sed -i 's|Ops\.h|ops.h|g' $(grep -l "Ops\.h" * -r)
+
+echo "> make gradlew executable"
+chmod +x ./gradlew
+
+echo "> gitignore secrets"
+echo "keystore.properties" >> .gitignore
+echo "keystore.kjs" >> .gitignore
+
+echo "> patch app/build.gradle to add custom suffix to build"
+SUFFIX=${SUFFIX:-gwh}
+BUILD_SUFFIXES=" versionNameSuffix \"-${SUFFIX}\"\n        versionName"
+ESCAPED_BUILD_SUFFIXES="$(echo "${BUILD_SUFFIXES}" | sed ':a;N;$!ba;s/\n/\\n/g' | sed 's/\$/\\$/g')"
+sed -i 's/ versionName/'"${ESCAPED_BUILD_SUFFIXES}"'/' app/build.gradle
+sed -i 's/Emu48-v$versionName/$applicationId-v$versionName$versionNameSuffix/' app/build.gradle
+
+# not necessary but it makes code readable
+echo "> translitterate windows-encoded ß to 'ss'"
+sed -i 's/'$(echo "\0337")'/ss/g' ./app/src/main/cpp/core/*
+
+echo "> remove those ugly ^M characters"
+fd -e c \
+   -e h \
+   -e C \
+   -e H \
+   -e java \
+   -e kml \
+   -e KML \
+   -e kmi \
+   -e htm \
+   -e pro \
+   -e xml \
+   -e txt \
+   -e gradle \
+   -e properties \
+   -x sed -i 's|
||g'
+
+echo "> prettify all C code"
+clang-format -i $(fd -e c -e h)
diff --git a/pull-KMLs-and-ROMs.sh b/pull-KMLs-and-ROMs.sh
new file mode 100755
index 0000000..1685010
--- /dev/null
+++ b/pull-KMLs-and-ROMs.sh
@@ -0,0 +1,61 @@
+#!/bin/bash
+
+set -eu
+
+cd "$(dirname "$0")" || exit 1
+
+cd ./app/src/main/assets/ || exit 1
+
+[ -d ./calculators.bkp ] && rm -fr ./calculators.bkp
+cp -a ./calculators ./calculators.bkp
+
+cd ./calculators || exit 1
+
+rm -fr ./realcalcs* ./rom.* ./gxrom* ./sxrom* ./*.ico ./*.kml ./*.png ./*.kmi ./readme-rom.49g.txt
+
+echo "Pulling Eric Rechlin's Real Calcs KML Scripts for Emu48 and Emu48+"
+wget -c "https://www.hpcalc.org/hp48/pc/emulators/realcalcs.zip"
+unzip realcalcs.zip
+rm realcalcs.zip
+mv ./docs ./realcalcs-docs
+mv ./skins/* ./
+rm -fr ./skins
+
+wget -c "https://www.hpcalc.org/hp49/pc/emulators/realcalcsplus.zip"
+unzip realcalcsplus.zip
+rm realcalcsplus.zip
+mv ./docs ./realcalcsplus-docs
+mv ./skins/* ./
+rm -fr ./skins
+
+echo " …removing the medium versions"
+rm ./*-m.kml ./*-m.png ./*-mc.kml ./*-mc.png ./*-muc.kml ./*-muc.png
+
+echo "Pulling ROM for 38g"
+curl "https://www.hpcalc.org/hp38/pc/38grom.zip" --output - | funzip > "rom.38g"
+
+echo "Pulling ROM for 39g"
+curl "https://www.hpcalc.org/hp39/pc/rom3940.zip" --output - | funzip > "rom.39g"
+
+echo "Pulling ROM for 48S(X)"
+curl "https://www.hpcalc.org/hp48/pc/emulators/sxrom-a.zip" --output - | funzip > "sxrom-a"
+curl "https://www.hpcalc.org/hp48/pc/emulators/sxrom-b.zip" --output - | funzip > "sxrom-b"
+curl "https://www.hpcalc.org/hp48/pc/emulators/sxrom-c.zip" --output - | funzip > "sxrom-c"
+curl "https://www.hpcalc.org/hp48/pc/emulators/sxrom-d.zip" --output - | funzip > "sxrom-d"
+curl "https://www.hpcalc.org/hp48/pc/emulators/sxrom-e.zip" --output - | funzip > "sxrom-e"
+curl "https://www.hpcalc.org/hp48/pc/emulators/sxrom-j.zip" --output - | funzip > "sxrom-j"
+
+echo "Pulling ROM for 48G(X)"
+curl "https://www.hpcalc.org/hp48/pc/emulators/gxrom-l.zip" --output - | funzip > "gxrom-l"
+curl "https://www.hpcalc.org/hp48/pc/emulators/gxrom-m.zip" --output - | funzip > "gxrom-m"
+curl "https://www.hpcalc.org/hp48/pc/emulators/gxrom-p.zip" --output - | funzip > "gxrom-p"
+curl "https://www.hpcalc.org/hp48/pc/emulators/gxrom-r.zip" --output - | funzip > "gxrom-r"
+
+cp sxrom-j rom.48s
+cp gxrom-r rom.48g
+
+echo "Pulling ROM for 49G(+) / 50g"
+wget -c "https://www.hpcalc.org/hp49/pc/rom/hp4950emurom.zip"
+unzip hp4950emurom.zip
+rm hp4950emurom.zip
+mv ./readme.txt ./readme-rom.49g.txt
diff --git a/pull-emu48plus-sources.sh b/pull-emu48plus-sources.sh
new file mode 100755
index 0000000..fb9ecd3
--- /dev/null
+++ b/pull-emu48plus-sources.sh
@@ -0,0 +1,33 @@
+#!/bin/zsh
+
+set -eu
+
+cd "$(dirname "$0")" || exit 1
+
+cd ./app/src/main/cpp/ || exit 1
+
+[ -d ./emu48plus.bkp ] && rm -fr ./emu48plus.bkp
+[ -d ./emu48plus ] && mv ./emu48plus ./emu48plus.bkp
+
+echo "Pulling Emu48+ sources"
+wget -c "https://www.hpcalc.org/hp48/pc/emulators/e48sp65plus.zip"
+unzip e48sp65plus.zip source.zip
+unzip -d emu48plus source.zip
+rm e48sp65plus.zip source.zip
+
+echo "Correct filenames' case"
+cd emu48plus || exit 1
+
+sed -i 's/'$(echo "\0337")'/ss/g' ./*
+
+for f in ./*; do
+    dos2unix "$f"
+
+    echo "$f" | grep -q "[A-Z]" && mv "$f" "$(echo "$f" | tr '[:upper:]' '[:lower:]')"
+done
+sed -i 's|Emu48\.h|emu48.h|g' ./*
+sed -i 's|Emu48Dll\.h|emu48dll.h|g' ./*
+sed -i 's|Opcodes\.h|opcodes.h|g' ./*
+sed -i 's|Ops\.h|ops.h|g' ./*
+
+clang-format -i ./*.c ./*.h