Latest compatible version of Classicube from the original GitHub repository (https://github.com/ClassiCube/ClassiCube) that can be compiled on Classicube for PowerMac PPC running Mac OS X 10.4.

android/app/CMakeLists.txt

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+#
+# Copyright (C) The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+cmake_minimum_required(VERSION 3.4.1)
+
+# build native_app_glue as a static lib
+set(${CMAKE_C_FLAGS}, "${CMAKE_C_FLAGS}")
+# now build app's shared lib
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11 -Wall -Werror")
+
+add_library(classicube SHARED
+        ../../src/main.c
+        ../../src/IsometricDrawer.c
+        ../../src/Builder.c
+        ../../src/ExtMath.c
+        ../../src/_ftbitmap.c
+        ../../src/Utils.c
+        ../../src/Camera.c
+        ../../src/Game.c
+        ../../src/GameVersion.c
+        ../../src/Window_Android.c
+        ../../src/_ftbase.c
+        ../../src/Graphics_GL2.c
+        ../../src/Deflate.c
+        ../../src/_cff.c
+        ../../src/_ftsynth.c
+        ../../src/String.c
+        ../../src/LWidgets.c
+        ../../src/Options.c
+        ../../src/Drawer2D.c
+        ../../src/Server.c
+        ../../src/Entity.c
+        ../../src/Drawer.c
+        ../../src/Vorbis.c
+        ../../src/Protocol.c
+        ../../src/World.c
+        ../../src/SelOutlineRenderer.c
+        ../../src/Platform_Posix.c
+        ../../src/Platform_Android.c
+        ../../src/LScreens.c
+        ../../src/_truetype.c
+        ../../src/_ftglyph.c
+        ../../src/Model.c
+        ../../src/_autofit.c
+        ../../src/Vectors.c
+        ../../src/HeldBlockRenderer.c
+        ../../src/Inventory.c
+        ../../src/Launcher.c
+        ../../src/Block.c
+        ../../src/LWeb.c
+        ../../src/Stream.c
+        ../../src/Lighting.c
+        ../../src/Resources.c
+        ../../src/PackedCol.c
+        ../../src/Screens.c
+        ../../src/Formats.c
+        ../../src/_sfnt.c
+        ../../src/Bitmap.c
+        ../../src/EntityComponents.c
+        ../../src/_pshinter.c
+        ../../src/Http_Worker.c
+        ../../src/MapRenderer.c
+        ../../src/Audio.c
+        ../../src/_ftinit.c
+        ../../src/Event.c
+        ../../src/Logger.c
+        ../../src/Widgets.c
+        ../../src/TexturePack.c
+        ../../src/Menus.c
+        ../../src/BlockPhysics.c
+        ../../src/_psmodule.c
+        ../../src/Chat.c
+        ../../src/Gui.c
+        ../../src/AxisLinesRenderer.c
+        ../../src/Picking.c
+        ../../src/_type1.c
+        ../../src/_smooth.c
+        ../../src/_psaux.c
+        ../../src/Generator.c
+        ../../src/Input.c
+        ../../src/Particle.c
+        ../../src/Physics.c
+        ../../src/SelectionBox.c
+        ../../src/EnvRenderer.c
+        ../../src/Animations.c
+        ../../src/LBackend.c
+        ../../src/SystemFonts.c
+        ../../src/Commands.c
+        ../../src/EntityRenderers.c
+        ../../src/Audio_SLES.c
+        ../../src/TouchUI.c
+        ../../src/LBackend_Android.c
+        ../../src/InputHandler.c
+        ../../src/MenuOptions.c
+        ../../src/FancyLighting.c
+        ../../src/Queue.c
+        )
+
+# add lib dependencies
+target_link_libraries(classicube
+    android
+    EGL
+    GLESv2
+    log
+    OpenSLES
+    jnigraphics)

android/app/build.gradle

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+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 28
+
+    defaultConfig {
+        applicationId = 'com.classicube.android.client'
+        minSdkVersion 13
+        targetSdkVersion 26
+        externalNativeBuild {
+            cmake {
+                arguments '-DANDROID_STL=c++_static'
+            }
+        }
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'),
+                    'proguard-rules.pro'
+        }
+    }
+    externalNativeBuild {
+        cmake {
+            version '3.10.2'
+            path 'CMakeLists.txt'
+        }
+    }
+}

android/app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<!-- BEGIN_INCLUDE(manifest) -->
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+          package="com.classicube.android.client"
+          android:versionCode="1370"
+          android:versionName="1.3.7">
+
+  <uses-permission android:name="android.permission.INTERNET" />
+  <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" android:maxSdkVersion="18" />
+  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" android:maxSdkVersion="18" />
+  <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="26"/>
+  
+  <application android:icon="@mipmap/ccicon" android:label="ClassiCube">
+    <provider
+        android:name="com.classicube.CCFileProvider"
+        android:authorities="com.classicube.android.client.provider"
+        android:exported="false"
+        android:grantUriPermissions="true" >
+    </provider>
+
+    <activity android:name="com.classicube.MainActivity" android:label="ClassiCube"
+              android:configChanges="orientation|screenSize|keyboard|keyboardHidden">
+
+      <intent-filter>
+        <action android:name="android.intent.action.MAIN" />
+        <category android:name="android.intent.category.LAUNCHER" />
+      </intent-filter>
+    </activity>
+  </application>
+
+</manifest>
+<!-- END_INCLUDE(manifest) -->

android/app/src/main/java/com/classicube/CCFileProvider.java

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+package com.classicube;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.util.ArrayList;
+
+import android.content.ContentProvider;
+import android.content.ContentValues;
+import android.content.Context;
+import android.content.pm.ProviderInfo;
+import android.database.Cursor;
+import android.database.MatrixCursor;
+import android.net.Uri;
+import android.os.ParcelFileDescriptor;
+import android.provider.MediaStore;
+import android.provider.OpenableColumns;
+
+public class CCFileProvider extends ContentProvider
+{
+    final static String[] DEFAULT_COLUMNS = { OpenableColumns.DISPLAY_NAME, OpenableColumns.SIZE, MediaStore.MediaColumns.DATA };
+    File root;
+
+    @Override
+    public boolean onCreate() {
+        return true;
+    }
+
+    @Override
+    public void attachInfo(Context context, ProviderInfo info) {
+        super.attachInfo(context, info);
+        root = context.getExternalFilesDir(null); // getGameDataDirectory
+    }
+
+    @Override
+    public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
+        File file = getFileForUri(uri);
+        // can be null when caller is requesting all columns
+        if (projection == null) projection = DEFAULT_COLUMNS;
+
+        ArrayList<String> cols = new ArrayList<String>(3);
+        ArrayList<Object> vals = new ArrayList<Object>(3);
+
+        for (String column : projection) {
+            if (column.equals(OpenableColumns.DISPLAY_NAME)) {
+                cols.add(OpenableColumns.DISPLAY_NAME);
+                vals.add(file.getName());
+            } else if (column.equals(OpenableColumns.SIZE)) {
+                cols.add(OpenableColumns.SIZE);
+                vals.add(file.length());
+            } else if (column.equals(MediaStore.MediaColumns.DATA)) {
+                cols.add(MediaStore.MediaColumns.DATA);
+                vals.add(file.getAbsolutePath());
+            }
+        }
+
+        // https://stackoverflow.com/questions/4042434/converting-arrayliststring-to-string-in-java
+        MatrixCursor cursor = new MatrixCursor(cols.toArray(new String[0]), 1);
+        cursor.addRow(vals.toArray());
+        return cursor;
+    }
+
+    @Override
+    public String getType(Uri uri) {
+        String path = uri.getEncodedPath();
+        int sepExt  = path.lastIndexOf('.');
+
+        if (sepExt >= 0) {
+            String fileExt = path.substring(sepExt);
+            if (fileExt.equals(".png")) return "image/png";
+        }
+        return "application/octet-stream";
+    }
+
+    @Override
+    public Uri insert(Uri uri, ContentValues values) {
+        throw new UnsupportedOperationException("Readonly access");
+    }
+
+    @Override
+    public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
+        throw new UnsupportedOperationException("Readonly access");
+    }
+
+    @Override
+    public int delete(Uri uri, String selection, String[] selectionArgs) {
+        throw new UnsupportedOperationException("Readonly access");
+    }
+
+    @Override
+    public ParcelFileDescriptor openFile(Uri uri, String mode) throws FileNotFoundException {
+        File file = getFileForUri(uri);
+        return ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_ONLY);
+    }
+
+    public static Uri getUriForFile(String path) {
+        // See AndroidManifest.xml for authority
+        return new Uri.Builder()
+                .scheme("content")
+                .authority("com.classicube.android.client.provider")
+                .encodedPath(Uri.encode(path, "/"))
+                .build();
+    }
+
+    File getFileForUri(Uri uri) {
+        String path = uri.getPath();
+        File file   = new File(root, path);
+
+        file = file.getAbsoluteFile();
+        // security validation check
+        if (!file.getPath().startsWith(root.getPath())) {
+            throw new SecurityException("Resolved path lies outside app directory:" + path);
+        }
+        return file;
+    }
+}

android/app/src/main/java/com/classicube/CCMotionListener.java

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+package com.classicube;
+import android.view.InputDevice;
+import android.view.MotionEvent;
+import android.view.View;
+
+public class CCMotionListener implements View.OnGenericMotionListener {
+    MainActivity activity;
+
+    public CCMotionListener(MainActivity activity) {
+        this.activity = activity;
+    }
+
+    // https://developer.android.com/develop/ui/views/touch-and-input/game-controllers/controller-input#java
+    @Override
+    public boolean onGenericMotion(View view, MotionEvent event) {
+        if (event.getAction() != MotionEvent.ACTION_MOVE) return false;
+        boolean source_joystick = (event.getSource() & InputDevice.SOURCE_JOYSTICK) == InputDevice.SOURCE_JOYSTICK;
+        boolean source_gamepad  = (event.getSource() & InputDevice.SOURCE_GAMEPAD)  == InputDevice.SOURCE_GAMEPAD;
+
+        if (source_joystick || source_gamepad) {
+            int historySize = event.getHistorySize();
+            for (int i = 0; i < historySize; i++) {
+                processJoystickInput(event, i);
+            }
+
+            processJoystickInput(event, -1);
+            return true;
+        }
+        return false;
+    }
+
+    void processJoystickInput(MotionEvent event, int historyPos) {
+        float x1 = getAxisValue(event, MotionEvent.AXIS_X,  historyPos);
+        float y1 = getAxisValue(event, MotionEvent.AXIS_Y,  historyPos);
+
+        float x2 = getAxisValue(event, MotionEvent.AXIS_Z,  historyPos);
+        float y2 = getAxisValue(event, MotionEvent.AXIS_RZ, historyPos);
+
+        if (x1 != 0 || y1 != 0)
+            pushAxisMovement(MainActivity.CMD_GPAD_AXISL, x1, y1);
+        if (x2 != 0 || y2 != 0)
+            pushAxisMovement(MainActivity.CMD_GPAD_AXISR, x2, y2);
+    }
+
+    float getAxisValue(MotionEvent event, int axis, int historyPos) {
+        float value = historyPos < 0 ? event.getAxisValue(axis) :
+                        event.getHistoricalAxisValue(axis, historyPos);
+
+        // Deadzone detection
+        if (value >= -0.25f && value <= 0.25f) value = 0;
+        return value;
+    }
+
+    void pushAxisMovement(int axis, float x, float y) {
+        activity.pushCmd(axis, (int)(x * 4096), (int)(y * 4096));
+    }
+}

android/app/src/main/java/com/classicube/CCView.java

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+package com.classicube;
+import android.text.Editable;
+import android.text.Selection;
+import android.text.SpannableStringBuilder;
+import android.view.KeyEvent;
+import android.view.MotionEvent;
+import android.view.SurfaceView;
+import android.view.inputmethod.BaseInputConnection;
+import android.view.inputmethod.EditorInfo;
+import android.view.inputmethod.InputConnection;
+
+public class CCView extends SurfaceView {
+    SpannableStringBuilder kbText;
+    MainActivity activity;
+
+    public CCView(MainActivity activity) {
+        // setFocusable, setFocusableInTouchMode - API level 1
+        super(activity);
+        this.activity = activity;
+        setFocusable(true);
+        setFocusableInTouchMode(true);
+    }
+
+    @Override
+    public boolean dispatchTouchEvent(MotionEvent ev) {
+        return activity.handleTouchEvent(ev) || super.dispatchTouchEvent(ev);
+    }
+
+    @Override
+    public InputConnection onCreateInputConnection(EditorInfo attrs) {
+        // BaseInputConnection, IME_ACTION_GO, IME_FLAG_NO_EXTRACT_UI - API level 3
+        attrs.actionLabel = null;
+        attrs.inputType   = MainActivity.calcKeyboardType(activity.keyboardType);
+        attrs.imeOptions  = MainActivity.calcKeyboardOptions(activity.keyboardType);
+
+        kbText = new SpannableStringBuilder(activity.keyboardText);
+
+        InputConnection ic = new BaseInputConnection(this, true) {
+            boolean inited;
+
+            void updateText() {
+                activity.pushCmd(MainActivity.CMD_KEY_TEXT, kbText.toString());
+            }
+
+            @Override
+            public Editable getEditable() {
+                if (!inited) {
+                    // needed to set selection, otherwise random crashes later with backspacing
+                    // set selection to end, so backspacing after opening keyboard with text still works
+                    Selection.setSelection(kbText, kbText.toString().length());
+                    inited = true;
+                }
+                return kbText;
+            }
+
+            @Override
+            public boolean setComposingText(CharSequence text, int newCursorPosition) {
+                boolean success = super.setComposingText(text, newCursorPosition);
+                updateText();
+                return success;
+            }
+
+            @Override
+            public boolean deleteSurroundingText(int beforeLength, int afterLength) {
+                boolean success = super.deleteSurroundingText(beforeLength, afterLength);
+                updateText();
+                return success;
+            }
+
+            @Override
+            public boolean commitText(CharSequence text, int newCursorPosition) {
+                boolean success = super.commitText(text, newCursorPosition);
+                updateText();
+                return success;
+            }
+
+            @Override
+            public boolean sendKeyEvent(KeyEvent ev) {
+                // getSelectionStart - API level 1
+                if (ev.getAction() != KeyEvent.ACTION_DOWN) return super.sendKeyEvent(ev);
+                int code = ev.getKeyCode();
+                int uni = ev.getUnicodeChar();
+
+                // start is -1 sometimes, and trying to insert/delete there crashes
+                int start = Selection.getSelectionStart(kbText);
+                if (start == -1) start = kbText.toString().length();
+
+                if (code == KeyEvent.KEYCODE_ENTER) {
+                    // enter maps to \n but that should not be intercepted
+                } else if (code == KeyEvent.KEYCODE_DEL) {
+                    if (start <= 0) return false;
+                    kbText.delete(start - 1, start);
+                    updateText();
+                    return false;
+                } else if (uni != 0) {
+                    kbText.insert(start, String.valueOf((char) uni));
+                    updateText();
+                    return false;
+                }
+                return super.sendKeyEvent(ev);
+            }
+
+        };
+        //String text = MainActivity.this.keyboardText;
+        //if (text != null) ic.setComposingText(text, 0);
+        return ic;
+    }
+}

android/app/src/main/res/values/strings.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+</resources>