diff '--color=auto' -ur NativeThread.orig/Makefile NativeThread/Makefile
--- NativeThread.orig/Makefile	2022-06-18 18:30:58.000000000 +0200
+++ NativeThread/Makefile	2025-10-09 20:43:37.444094419 +0200
@@ -10,7 +10,8 @@
 	$(CC) $(CFLAGS) -o libNativeThread.so $(LDFLAGS) NativeThread.c $(LIBS)
 
 NativeThread.h:
-	javah -o NativeThread.h -classpath $(CLASSPATH) freenet.support.io.NativeThread
+	javac -h . -classpath /usr/share/freenet/lib/freenet.jar:/usr/share/jna-4/lib/jna.jar:/usr/share/jna-4/lib/jna-platform.jar NativeThread.java
+	mv freenet_support_io_NativeThread_LinuxNativeThread.h NativeThread.h
 
 clean:
 	-rm -f *.class NativeThread.h libNativeThread*.so