diff --git a/src/Tools/Setup/isabelle/setup/Build_Scala.java b/src/Tools/Setup/isabelle/setup/Build_Scala.java
--- a/src/Tools/Setup/isabelle/setup/Build_Scala.java
+++ b/src/Tools/Setup/isabelle/setup/Build_Scala.java
@@ -1,169 +1,212 @@
 /*  Title:      Tools/Setup/isabelle/setup/Build_Scala.java
     Author:     Makarius
 
 Build Isabelle/Scala modules.
 */
 
 package isabelle.setup;
 
 
 import java.io.File;
 import java.io.IOException;
 import java.math.BigInteger;
 import java.nio.file.Files;
 import java.nio.file.Path;
+import java.nio.file.StandardCopyOption;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
-import java.util.Arrays;
 import java.util.Comparator;
 import java.util.HashMap;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
 import java.util.Properties;
 import java.util.stream.Stream;
 
 
 public class Build_Scala
 {
     public static class Context
     {
         private final Path component_dir;
         private Properties props;
 
         public Context(Path dir) throws IOException
         {
             component_dir = dir;
             props = new Properties();
             Path path = component_dir.resolve("etc/scala.props");
             if (Files.exists(path)) { props.load(Files.newBufferedReader(path)); }
         }
 
         @Override public String toString() { return component_dir.toString(); }
 
         public String component_name() { return component_dir.toFile().getName(); }
         public String name() { return props.getProperty("name", component_name()); }
         public String description() { return props.getProperty("description", name()); }
 
         public String lib_name() { return props.getProperty("lib", "lib") + "/" + name(); }
         public String jar_name() { return lib_name() + ".jar"; }
         public String shasum_name() { return lib_name() + ".shasum"; }
 
         public String main() { return props.getProperty("main", ""); }
 
         public String[] sources() { return props.getProperty("sources", "").split("\\s+"); }
+        public String[] resources() { return props.getProperty("resources", "").split("\\s+"); }
         public String[] services() { return props.getProperty("services", "").split("\\s+"); }
 
         public Path path(String file) { return component_dir.resolve(file); }
         public boolean exists(String file) { return Files.exists(path(file)); }
 
+        public String resource_name(String s)
+        {
+            int i = s.indexOf(':');
+            return i > 0 ? s.substring(0, i) : s;
+        }
+
+        public String resource_target(String s)
+        {
+            int i = s.indexOf(':');
+            return i > 0 ? s.substring(i + 1) : s;
+        }
+
         public String shasum(String file)
             throws IOException, NoSuchAlgorithmException
         {
             if (exists(file)) {
                 MessageDigest sha = MessageDigest.getInstance("SHA");
                 sha.update(Files.readAllBytes(path(file)));
                 String digest = new BigInteger(1, sha.digest()).toString(16);
                 return digest + " *" + file + "\n";
             }
             else { return ""; }
         }
     }
 
     public static void build_scala(Context context, boolean fresh)
         throws IOException, InterruptedException, NoSuchAlgorithmException
     {
         String jar_name = context.jar_name();
         String shasum_name = context.shasum_name();
 
         String[] sources = context.sources();
+        String[] resources = context.resources();
 
         if (sources.length == 0) {
             Files.deleteIfExists(context.path(jar_name));
             Files.deleteIfExists(context.path(shasum_name));
         }
         else {
             String shasum_old =
                 context.exists(shasum_name) ? Files.readString(context.path(shasum_name)) : "";
             String shasum_sources;
             {
                 StringBuilder _shasum = new StringBuilder();
                 for (String s : sources) { _shasum.append(context.shasum(s)); }
+                for (String s : resources) {
+                    _shasum.append(context.shasum(context.resource_name(s)));
+                }
                 shasum_sources = _shasum.toString();
             }
             if (fresh || !shasum_old.equals(context.shasum(jar_name) + shasum_sources)) {
                 System.out.println("### Building " + context.description() + " ...");
 
                 String java_home = Environment.getenv("JAVA_HOME");
                 String scala_home = Environment.getenv("SCALA_HOME");
                 String scalac_options = Environment.getenv("ISABELLE_SCALAC_OPTIONS");
                 String isabelle_class_path = Environment.getenv("ISABELLE_CLASSPATH");
 
                 if (java_home.isEmpty()) {
                     throw new RuntimeException("Unknown JAVA_HOME -- Java unavailable");
                 }
                 if (scala_home.isEmpty()) {
                     throw new RuntimeException("Unknown SCALA_HOME -- Scala unavailable");
                 }
 
                 Path build_dir = Files.createTempDirectory("isabelle");
                 try {
                     /* classpath */
 
                     List<String> classpath = new LinkedList<String>();
                     for (String s : isabelle_class_path.split(":", -1)) {
                         classpath.add(Environment.platform_path(s));
                     }
 
                     Map<String,String> env = new HashMap<String,String>(Environment.settings());
                     env.put("CLASSPATH", String.join(File.pathSeparator, classpath));
 
 
-                    /* scalac */
+                    /* compile sources */
 
                     List<String> cmd = new LinkedList<String>();
                     Environment.Exec_Result res;
 
                     cmd.add(Environment.platform_path(scala_home + "/bin/scalac"));
                     for (String s : scalac_options.split("\\s+")) { cmd.add(s); }
                     cmd.add("-d");
                     cmd.add(build_dir.toString());
                     for (String s : sources) { cmd.add(context.path(s).toString()); }
 
                     res = Environment.exec_process(cmd, build_dir.toFile(), env, false);
                     if (!res.ok()) throw new RuntimeException(res.err());
 
 
+                    /* copy resources */
+
+                    for (String s : context.resources()) {
+                        String name = context.resource_name(s);
+                        String target = context.resource_target(s);
+                        Path file_name = Path.of(name).normalize().getFileName();
+                        Path target_path = Path.of(target).normalize();
+
+                        Path target_dir;
+                        Path target_file;
+                        {
+                            if (target.endsWith("/") || target.endsWith("/.")) {
+                                target_dir = build_dir.resolve(target_path);
+                                target_file = target_dir.resolve(file_name);
+                            }
+                            else {
+                                target_file = build_dir.resolve(target_path);
+                                target_dir = target_file.getParent();
+                            }
+                        }
+                        Files.createDirectories(target_dir);
+                        Files.copy(context.path(name), target_file,
+                            StandardCopyOption.COPY_ATTRIBUTES);
+                    }
+
+
                     /* jar */
 
                     cmd.clear();
                     cmd.add(Environment.platform_path(java_home + "/bin/jar"));
                     cmd.add("-c");
                     cmd.add("-f");
                     cmd.add(context.path(jar_name).toString());
                     if (!context.main().isEmpty()) {
                         cmd.add("-e");
                         cmd.add(context.main());
                     }
                     cmd.add(".");
 
                     res = Environment.exec_process(cmd, build_dir.toFile(), env, false);
                     if (!res.ok()) throw new RuntimeException(res.err());
 
 
                     /* shasum */
 
                     String shasum = context.shasum(jar_name) + shasum_sources;
                     Files.writeString(context.path(shasum_name), shasum);
                 }
                 finally {
                     try (Stream<Path> walk = Files.walk(build_dir)) {
                         walk.sorted(Comparator.reverseOrder())
                             .map(Path::toFile)
                             .forEach(File::delete);
                     }
                 }
             }
         }
     }
 }